diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/utils/TraversalType.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/utils/TraversalType.java
new file mode 100644
index 0000000..d5b58f9
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/utils/TraversalType.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.utils;
+
+/**
+ * Represents traversal type of the YANG node tree.
+ */
+public enum TraversalType {
+
+    /*
+     * Start of traversal at the tree root.
+     */
+    ROOT,
+
+    /*
+     * Child node traversal.
+     */
+    CHILD,
+
+    /*
+     * Sibling node traversal.
+     */
+    SIBLING,
+
+    /*
+     * Parent node traversal.
+     */
+    PARENT
+}
+
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/utils/package-info.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/utils/package-info.java
new file mode 100644
index 0000000..5957cf3
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/utils/package-info.java
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Provides implementation of build and obtain YANG data tree which is data
+ * (sub)instance representation, abstract of protocol.
+ */
+package org.onosproject.yms.app.utils;
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AppData.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AppData.java
new file mode 100644
index 0000000..8fee570
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AppData.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yms.ydt.YdtContext;
+
+import java.util.List;
+
+/**
+ * Maintains application data, which will be used by Application broker to
+ * interact with applications.
+ */
+public interface AppData {
+
+    /**
+     * Returns the list of nodes with operation type delete.
+     *
+     * @return list of nodes with operation type delete
+     */
+    List<YdtContext> getDeleteNodes();
+
+    /**
+     * Adds the ydt node with operation type delete in module delete node list.
+     *
+     * @param node ydt node with operation type delete/remove
+     */
+    void addDeleteNodes(YdtContext node);
+
+    /**
+     * Returns application's root ydtContext.
+     *
+     * @return YdtContext of application root node
+     */
+    YdtContext getModuleContext();
+
+    /**
+     * Sets the application's ydtContext.
+     *
+     * @param moduleNode application's ydtContext
+     */
+    void setModuleContext(YdtContext moduleNode);
+
+    /**
+     * Returns the YangSchemaNode of augmenting application.
+     *
+     * @return YangSchemaNode of augmenting application
+     */
+    YangSchemaNode getAugmentingSchemaNode();
+
+    /**
+     * Sets the YangSchemaNode of augmenting application root node.
+     *
+     * @param schemaNode YangSchemaNode of augmenting application module
+     */
+    void setAugmentingSchemaNode(YangSchemaNode schemaNode);
+
+    /**
+     * Returns the schema node current context.
+     *
+     * @return schema node
+     */
+    YangSchemaNode getSchemaNode();
+
+    /**
+     * Returns the root/module schema node current application.
+     *
+     * @return schema node
+     */
+    YangSchemaNode getRootSchemaNode();
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AppNodeFactory.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AppNodeFactory.java
new file mode 100644
index 0000000..621eda6
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AppNodeFactory.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import static org.onosproject.yms.app.ydt.DefaultYdtAppContext.getAugmentAppContext;
+import static org.onosproject.yms.app.ydt.DefaultYdtAppContext.getModuleAppContext;
+
+/**
+ * Represents an application tree node factory to create different types of
+ * application tree node.
+ */
+public final class AppNodeFactory {
+
+    // No instantiation
+    private AppNodeFactory() {
+    }
+
+    /**
+     * Returns the appropriate application context on the basis of provided
+     * isAugmented flag for given request.
+     *
+     * @param isAugmented true for augmented context; false for module context
+     * @return appContext application context
+     */
+    public static DefaultYdtAppContext getAppContext(boolean isAugmented) {
+        return isAugmented ? getAugmentAppContext() : getModuleAppContext();
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AppType.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AppType.java
new file mode 100644
index 0000000..4d581a3
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AppType.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+/**
+ * Represents type of application, which is intended to maintain additional
+ * information in YDT node.
+ */
+public enum AppType {
+
+    /**
+     * YANG tree builder application.
+     */
+    YTB,
+
+    /**
+     * YANG object builder application.
+     */
+    YOB
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AugmentedSchemaData.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AugmentedSchemaData.java
new file mode 100644
index 0000000..6a45cad
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/AugmentedSchemaData.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+import org.onosproject.yms.ydt.YdtContext;
+
+import java.util.List;
+
+/**
+ * Manages the application information required for schema nodes defined in
+ * the module (sub-module).
+ */
+public class AugmentedSchemaData implements AppData {
+
+    private static final String E_NOT_ROOTAPP =
+            "Augmented application depends on root app.";
+    private static final String E_NOT_EXIST =
+            "Augmented nodes are not part of the schema.";
+    private static final String E_NOT_MAINTAINED =
+            "Module context is not maintained.";
+
+    /*
+     * Reference for schema node of augmenting application.
+     */
+    private YangSchemaNode augModSchema;
+
+    @Override
+    public List<YdtContext> getDeleteNodes() {
+        throw new YdtException(E_NOT_ROOTAPP);
+    }
+
+    @Override
+    public void addDeleteNodes(YdtContext deletedNode) {
+    }
+
+    @Override
+    public YdtContext getModuleContext() {
+        throw new YdtException(E_NOT_EXIST);
+    }
+
+    @Override
+    public void setModuleContext(YdtContext moduleContext) {
+        throw new YdtException(E_NOT_MAINTAINED);
+    }
+
+    @Override
+    public YangSchemaNode getAugmentingSchemaNode() {
+        return augModSchema;
+    }
+
+    @Override
+    public void setAugmentingSchemaNode(YangSchemaNode schemaNode) {
+        augModSchema = schemaNode;
+    }
+
+    @Override
+    public YangSchemaNode getSchemaNode() {
+        return augModSchema;
+    }
+
+    @Override
+    public YangSchemaNode getRootSchemaNode() {
+        return ((YangNode) getSchemaNode()).getParent();
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/DefaultYdtAppContext.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/DefaultYdtAppContext.java
new file mode 100644
index 0000000..f75fc9c
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/DefaultYdtAppContext.java
@@ -0,0 +1,302 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangAugment;
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeContextInfo;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+import org.onosproject.yms.ydt.YdtContext;
+import org.onosproject.yms.ydt.YdtContextOperationType;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.BOTH;
+import static org.onosproject.yms.app.ydt.YdtNodeFactory.getAppOpTypeFromYdtOpType;
+
+/**
+ * Represents YANG request work bench which contains all parameters for
+ * request handling and methods to build and obtain YANG application data tree
+ * which is data (sub)instance representation, abstract of protocol.
+ */
+public final class DefaultYdtAppContext<T extends AppData>
+        implements YdtAppContext {
+
+    /*
+     * Parent reference.
+     */
+    private YdtAppContext parent;
+
+    /*
+     * First child reference.
+     */
+    private YdtAppContext child;
+
+    /*
+     * Next sibling reference.
+     */
+    private YdtAppContext nextSibling;
+
+    /*
+     * Previous sibling reference.
+     */
+    private YdtAppContext previousSibling;
+
+    /*
+     * Last child reference.
+     */
+    private YdtAppContext lastChild;
+
+    /*
+     * YDT application tree extended information.
+     */
+    private T appData;
+
+    /*
+     * Reference for operation type for application root node.
+     */
+    private YdtAppNodeOperationType operationType;
+
+    /*
+     * Reference application node set.
+     */
+    private Set<YangSchemaNode> appSet;
+
+    /**
+     * Creates an instance of YANG application tree which is used by all node
+     * needs delete list.
+     */
+    private DefaultYdtAppContext() {
+        appSet = new HashSet<>();
+    }
+
+    /**
+     * Adds schema node of new requested augmented node in current context of
+     * application tree.
+     *
+     * @param schemaNode schema node of requested node
+     * @return addition result(true/false)
+     */
+    public boolean addSchemaToAppSet(YangSchemaNode schemaNode) {
+        return appSet.add(schemaNode);
+    }
+
+    @Override
+    public void updateAppOperationType(YdtContextOperationType ydtOpType) {
+        if (parent == null) {
+            return;
+        }
+        YdtAppNodeOperationType opType = getAppOpTypeFromYdtOpType(ydtOpType);
+        YdtAppContext curNode = this;
+        YdtAppNodeOperationType parentOpType = operationType;
+        if (parentOpType != null && opType != parentOpType) {
+            while (curNode.getOperationType() != BOTH &&
+                    curNode.getParent() != null) {
+                curNode.setOperationType(BOTH);
+                curNode = curNode.getParent();
+            }
+        }
+    }
+
+    @Override
+    public void setAppData(YdtNode moduleNode, YangSchemaNode augmentNode) {
+        if (augmentNode != null) {
+            appData.setAugmentingSchemaNode(augmentNode);
+        } else {
+            appData.setModuleContext(moduleNode);
+        }
+    }
+
+    @Override
+    public AppData getAppData() {
+        return appData;
+    }
+
+    @Override
+    public YdtAppContext getParent() {
+        return parent;
+    }
+
+    @Override
+    public void setParent(YdtAppContext parent) {
+        this.parent = parent;
+    }
+
+    @Override
+    public YdtAppContext getFirstChild() {
+        return child;
+    }
+
+    @Override
+    public void setChild(YdtAppContext child) {
+        this.child = child;
+    }
+
+    @Override
+    public YdtAppContext getNextSibling() {
+        return nextSibling;
+    }
+
+    @Override
+    public void setNextSibling(YdtAppContext nextSibling) {
+        this.nextSibling = nextSibling;
+    }
+
+    @Override
+    public YdtAppContext getPreviousSibling() {
+        return previousSibling;
+    }
+
+    @Override
+    public void setPreviousSibling(YdtAppContext previousSibling) {
+        this.previousSibling = previousSibling;
+    }
+
+    @Override
+    public YdtAppNodeOperationType getOperationType() {
+        return operationType;
+    }
+
+    @Override
+    public void setOperationType(YdtAppNodeOperationType opType) {
+        operationType = opType;
+    }
+
+    @Override
+    public List<YdtContext> getDeleteNodes() {
+        return appData.getDeleteNodes();
+    }
+
+
+    @Override
+    public void addDeleteNode(YdtNode node) {
+        DefaultYdtAppContext<?> curNode = this;
+        while (curNode.getParent().getParent() != null) {
+            curNode = (DefaultYdtAppContext<?>) curNode.getParent();
+        }
+
+        curNode.appData.addDeleteNodes(node);
+    }
+
+    @Override
+    public YdtContext getModuleContext() {
+        return appData.getModuleContext();
+    }
+
+    @Override
+    public void setModuleContext(YdtContext moduleNode) {
+        appData.setModuleContext(moduleNode);
+    }
+
+    @Override
+    public YangSchemaNode getAugmentingSchemaNode() {
+        return appData.getAugmentingSchemaNode();
+    }
+
+    @Override
+    public void setAugmentingSchemaNode(YangSchemaNode schemaNode) {
+        appData.setAugmentingSchemaNode(schemaNode);
+    }
+
+
+    @Override
+    public YangSchemaNode getAugmentingSchemaNode(
+            YangSchemaNodeIdentifier id,
+            YangSchemaNodeContextInfo contextInfo) {
+        YangSchemaNode lastAugMod = null;
+        YangSchemaNode switchedNode =
+                contextInfo.getContextSwitchedNode();
+
+        while (switchedNode != null) {
+            if (switchedNode instanceof YangAugment) {
+                lastAugMod = switchedNode;
+            }
+            try {
+                switchedNode = switchedNode.getChildSchema(id)
+                        .getContextSwitchedNode();
+            } catch (DataModelException e) {
+                throw new YdtException(e.getMessage());
+            }
+        }
+        return lastAugMod;
+    }
+
+    @Override
+    public YdtAppContext getLastChild() {
+        return lastChild;
+    }
+
+    @Override
+    public void setLastChild(YdtAppContext lastChild) {
+        this.lastChild = lastChild;
+    }
+
+    @Override
+    public void addChild(YdtAppContext newChild) {
+
+        if (newChild.getParent() == null) {
+            newChild.setParent(this);
+        }
+
+        // First child to be added.
+        if (getFirstChild() == null) {
+            setChild(newChild);
+            // Update last child.
+            setLastChild(newChild);
+            return;
+        }
+
+        // If the new node needs to be add as last child.
+        YdtAppContext curNode = getLastChild();
+        curNode.setNextSibling(newChild);
+        newChild.setPreviousSibling(curNode);
+        setLastChild(newChild);
+    }
+
+    @Override
+    public YangSchemaNode getYangSchemaNode() {
+        return appData.getSchemaNode();
+    }
+
+    /**
+     * Creates an instance of application tree context with module schema data.
+     *
+     * @return application tree context
+     */
+    public static DefaultYdtAppContext getModuleAppContext() {
+        DefaultYdtAppContext context =
+                new DefaultYdtAppContext<ModuleSchemaData>();
+        context.appData = new ModuleSchemaData();
+        return context;
+    }
+
+    /**
+     * Creates an instance of application tree context with augment schema data.
+     *
+     * @return application tree context
+     */
+    public static DefaultYdtAppContext getAugmentAppContext() {
+        DefaultYdtAppContext context =
+                new DefaultYdtAppContext<AugmentedSchemaData>();
+        context.appData = new AugmentedSchemaData();
+        return context;
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/DefaultYdtWalker.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/DefaultYdtWalker.java
new file mode 100644
index 0000000..bb692cf
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/DefaultYdtWalker.java
@@ -0,0 +1,125 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+
+import org.onosproject.yms.app.utils.TraversalType;
+import org.onosproject.yms.ydt.YdtContext;
+import org.onosproject.yms.ydt.YdtListener;
+
+import static org.onosproject.yms.app.utils.TraversalType.CHILD;
+import static org.onosproject.yms.app.utils.TraversalType.PARENT;
+import static org.onosproject.yms.app.utils.TraversalType.ROOT;
+import static org.onosproject.yms.app.utils.TraversalType.SIBLING;
+
+/**
+ * Represents implementation of YDT walker, which walks the YDT.
+ */
+public class DefaultYdtWalker implements YdtExtendedWalker {
+
+    @Override
+    public void walk(YdtListener ydtListener, YdtContext rootNode) {
+        walkTree(ydtListener, rootNode, false);
+    }
+
+    /**
+     * Walks the YANG data tree till the node provided by the user.
+     * Protocols implements YDT listener and YDT Extended Listener and
+     * walks YDT tree with input as implemented object.
+     * YDT walker provides call backs to implemented methods.
+     *
+     * @param ydtListener YDT listener implemented by the protocol
+     * @param rootNode    root node of YDT
+     * @param isExtended  flag denotes the call type
+     */
+    private void walkTree(YdtListener ydtListener, YdtContext rootNode,
+                          boolean isExtended) {
+        YdtContext curNode = rootNode;
+        TraversalType curTraversal = ROOT;
+
+        while (curNode != null) {
+            if (curTraversal != PARENT) {
+
+                // Visit (curNode) for entry callback
+                if (isExtended) {
+                    ((YdtExtendedListener) ydtListener)
+                            .enterYdtNode((YdtExtendedContext) curNode);
+                } else {
+                    ydtListener.enterYdtNode(curNode);
+                }
+            }
+            if (curTraversal != PARENT &&
+                    curNode.getFirstChild() != null) {
+                curTraversal = CHILD;
+                curNode = curNode.getFirstChild();
+            } else if (curNode.getNextSibling() != null) {
+                // Revisit (curNode) for exit callback
+                exitCallBack(ydtListener, curNode, isExtended);
+
+                /*
+                 *Stop traversing the tree , tree need to be traversed
+                 * till user requested node
+                 */
+                if (curNode.equals(rootNode)) {
+                    return;
+                }
+                curTraversal = SIBLING;
+                curNode = curNode.getNextSibling();
+            } else {
+                // Revisit (curNode) for exit callback
+                exitCallBack(ydtListener, curNode, isExtended);
+
+                /*
+                 *Stop traversing the tree , tree need to be traversed
+                 * till user requested node
+                 */
+                if (curNode.equals(rootNode)) {
+                    return;
+                }
+
+                curTraversal = PARENT;
+                curNode = curNode.getParent();
+            }
+        }
+    }
+
+    /**
+     * Provides exit call back per node on the basis of extended flag,
+     * If isExtended set then YdtExtendedListener exit node call back will
+     * be provided else YdtListener with respective type of context
+     * (YdtContext/YdtExtendedContext).
+     *
+     * @param ydtListener YDT listener implemented by the protocol
+     * @param curNode     current node of YDT
+     * @param isExtended  flag denotes the call type
+     */
+    private void exitCallBack(YdtListener ydtListener, YdtContext curNode,
+                              boolean isExtended) {
+        if (isExtended) {
+            ((YdtExtendedListener) ydtListener)
+                    .exitYdtNode((YdtExtendedContext) curNode);
+        } else {
+            ydtListener.exitYdtNode(curNode);
+        }
+    }
+
+    @Override
+    public void walk(YdtExtendedListener ydtExtendedListener,
+                     YdtExtendedContext rootNode) {
+        walkTree(ydtExtendedListener, rootNode, true);
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/ModuleSchemaData.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/ModuleSchemaData.java
new file mode 100644
index 0000000..fd4f1b6
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/ModuleSchemaData.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+import org.onosproject.yms.ydt.YdtContext;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Manages the application information required for schema nodes defined in
+ * the module (sub-module).
+ */
+public class ModuleSchemaData implements AppData {
+
+    private static final String E_NOT_MAINTAINED =
+            "Augmented info is not maintained.";
+
+    /*
+     * Reference for application's root ydtContext.
+     */
+    private YdtContext moduleContext;
+
+    /*
+     * Reference for list of nodes with operation type delete.
+     */
+    private List<YdtContext> deleteNodes = new ArrayList<>();
+
+    @Override
+    public List<YdtContext> getDeleteNodes() {
+        // This suppose to be mutable for YAB
+        return deleteNodes;
+    }
+
+    @Override
+    public void addDeleteNodes(YdtContext deletedNode) {
+        deleteNodes.add(deletedNode);
+    }
+
+    @Override
+    public YdtContext getModuleContext() {
+        return moduleContext;
+    }
+
+    @Override
+    public void setModuleContext(YdtContext moduleContext) {
+        this.moduleContext = moduleContext;
+    }
+
+    @Override
+    public YangSchemaNode getAugmentingSchemaNode() {
+        throw new YdtException(E_NOT_MAINTAINED);
+    }
+
+    @Override
+    public void setAugmentingSchemaNode(YangSchemaNode schemaNode) {
+        throw new YdtException(E_NOT_MAINTAINED);
+    }
+
+    @Override
+    public YangSchemaNode getSchemaNode() {
+        return ((YdtExtendedContext) moduleContext).getYangSchemaNode();
+    }
+
+    @Override
+    public YangSchemaNode getRootSchemaNode() {
+        return getSchemaNode();
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/RequestedCallType.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/RequestedCallType.java
new file mode 100644
index 0000000..ace971b
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/RequestedCallType.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+/**
+ * Represents type of YANG data tree creation method caller type.
+ */
+enum RequestedCallType {
+
+    /**
+     * Requested Node is of type single/multi instance leaf.
+     */
+    LEAF,
+
+    /**
+     * Requested Node is of type single/multi instance node.
+     */
+    OTHER,
+
+    /**
+     * Requested Node is of type multi instance leaf/node.
+     */
+    MULTI_INSTANCE,
+}
+
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/RequestedCardinality.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/RequestedCardinality.java
new file mode 100644
index 0000000..ed16951
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/RequestedCardinality.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+/**
+ * Represents type of YANG data tree node operation.
+ */
+enum RequestedCardinality {
+
+    /**
+     * Single instance of requested node.
+     */
+    SINGLE_INSTANCE,
+
+    /**
+     * Multi instance of requested node.
+     */
+    MULTI_INSTANCE,
+
+    /**
+     * Instance of requested node/leaf is unknown.
+     */
+    UNKNOWN,
+
+    /**
+     * Single instance of requested leaf.
+     */
+    SINGLE_INSTANCE_LEAF,
+
+    /**
+     * Multi instance of requested leaf.
+     */
+    MULTI_INSTANCE_LEAF
+}
+
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YangRequestWorkBench.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YangRequestWorkBench.java
new file mode 100644
index 0000000..5ae1230
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YangRequestWorkBench.java
@@ -0,0 +1,758 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import com.google.common.collect.ImmutableMap;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeContextInfo;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+import org.onosproject.yms.app.ysr.YangSchemaRegistry;
+import org.onosproject.yms.ydt.YdtContext;
+import org.onosproject.yms.ydt.YdtContextOperationType;
+import org.onosproject.yms.ydt.YdtType;
+import org.onosproject.yms.ydt.YmsOperationType;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import static org.onosproject.yangutils.datamodel.YangSchemaNodeType.YANG_MULTI_INSTANCE_LEAF_NODE;
+import static org.onosproject.yms.app.ydt.AppNodeFactory.getAppContext;
+import static org.onosproject.yms.app.ydt.RequestedCallType.LEAF;
+import static org.onosproject.yms.app.ydt.RequestedCallType.OTHER;
+import static org.onosproject.yms.app.ydt.RequestedCardinality.MULTI_INSTANCE;
+import static org.onosproject.yms.app.ydt.RequestedCardinality.MULTI_INSTANCE_LEAF;
+import static org.onosproject.yms.app.ydt.RequestedCardinality.SINGLE_INSTANCE;
+import static org.onosproject.yms.app.ydt.RequestedCardinality.UNKNOWN;
+import static org.onosproject.yms.app.ydt.YdtConstants.errorMsg;
+import static org.onosproject.yms.app.ydt.YdtNodeFactory.getAppOpTypeFromYdtOpType;
+import static org.onosproject.yms.ydt.YdtContextOperationType.CREATE;
+import static org.onosproject.yms.ydt.YdtContextOperationType.DELETE;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+import static org.onosproject.yms.ydt.YdtContextOperationType.REMOVE;
+import static org.onosproject.yms.ydt.YdtType.MULTI_INSTANCE_LEAF_VALUE_NODE;
+import static org.onosproject.yms.ydt.YdtType.MULTI_INSTANCE_NODE;
+
+/**
+ * Represents YANG request work bench which contains all parameters for
+ * request handling and methods to build and obtain YANG data tree
+ * which is data (sub)instance representation, abstract of protocol.
+ */
+public class YangRequestWorkBench implements YdtExtendedBuilder {
+
+    // ydt formatted error string
+    private static final String FMT_NOT_EXIST =
+            "Application with name \"%s\" doesn't exist.";
+    private static final String E_USE_ADDLEAF =
+            "Requested Node should be created using addLeaf interface";
+    private static final String E_MULTI_INS =
+            "Adds an instance of type list or leaf-list node only";
+    private static final String E_CREATE =
+            "Create request is not allowed under delete operation";
+    private static final String E_DEL =
+            "Delete request is not allowed under create operation";
+    private static final String E_INVOKE_PARENT =
+            "Can't invoke get parent at logical root node";
+    private static final String FMT_TOO_FEW =
+            "Too few key parameters in %s. Expected %d; actual %d.";
+    private static final String FMT_TOO_MANY =
+            "Too many key parameters in %s. Expected %d; actual %d.";
+
+    /*
+     * Current node in YANG data tree, kept to maintain the
+     * current context in YDT.
+     */
+    private YdtNode curNode;
+
+    /*
+     * Root node in YANG data tree, kept to maintain the root context in
+     * YDT.
+     */
+    private YdtNode rootNode;
+
+    /*
+     * Current node in YANG data tree, kept to maintain the current context
+     * in ydt application tree.
+     */
+    private YdtAppContext appCurNode;
+
+    /*
+     * Root node in YANG data tree, kept to maintain the root context in ydt
+     * application tree.
+     */
+    private YdtAppContext appRootNode;
+
+    /**
+     * Root Node Tag attribute in YANG data tree, kept to maintain the root
+     * tag attributes in YDT.
+     * <p>
+     * First key param of map represent tagName  name of tag attribute.
+     * Second param of map represent tagValue value of tag attribute
+     */
+    private Map<String, String> rootTagAttributeMap;
+
+    /*
+     * YANG schema registry reference.
+     */
+    private YangSchemaRegistry registry = null;
+
+    /*
+     * YMS operation type.
+     */
+    private final YmsOperationType ymsOperationType;
+
+    /*
+     * YDT default operation type.
+     */
+    private YdtContextOperationType ydtDefaultOpType;
+
+    /*
+     * Flag to identify data validation need to be done by YDT or not.
+     */
+    private final boolean validate;
+    // TODO validate need to be handle later with interaction type basis in
+    // future when it will be supported
+
+
+    /**
+     * Creates an instance of YANG request work bench which is use to initialize
+     * logical rootNode and and schema registry.
+     *
+     * @param name       name of logical container of a protocol
+     *                   which is a holder of the complete tree
+     * @param namespace  namespace of logical container
+     * @param opType     type of operation done by using YANG
+     *                   interface
+     * @param registry   Yang schema registry
+     * @param isValidate Flag to identify data validation need to be
+     *                   done by YDT or not
+     */
+    public YangRequestWorkBench(String name, String namespace,
+                                YmsOperationType opType,
+                                YangSchemaRegistry registry,
+                                boolean isValidate) {
+        YdtNode newNode;
+        YangSchemaNodeIdentifier nodeIdentifier =
+                new YangSchemaNodeIdentifier();
+        nodeIdentifier.setName(name);
+        nodeIdentifier.setNameSpace(namespace);
+        newNode = new YdtSingleInstanceNode(nodeIdentifier);
+        setRootNode(newNode);
+        this.registry = registry;
+        ymsOperationType = opType;
+        validate = isValidate;
+        // Set the logical root node for yang data app tree.
+        DefaultYdtAppContext appNode = getAppContext(true);
+
+        setAppRootNode(appNode);
+    }
+
+    /**
+     * Sets the logical root context information available in YDT node.
+     *
+     * @param node logical root node
+     */
+    private void setRootNode(YdtNode node) {
+        rootNode = node;
+        curNode = node;
+    }
+
+    /**
+     * Sets the app context tree logical root node  for ydt application tree.
+     *
+     * @param node application tree's logical root node
+     */
+    private void setAppRootNode(YdtAppContext node) {
+        appRootNode = node;
+        appCurNode = node;
+    }
+
+    /**
+     * Returns the YANG schema registry of Ydt.
+     * This method will be used by ytb.
+     *
+     * @return YANG schema registry
+     */
+    public YangSchemaRegistry getYangSchemaRegistry() {
+        return registry;
+    }
+
+    /**
+     * Returns the app context tree root node for ydt application tree.
+     * This method will be used by yab.
+     *
+     * @return YdtAppContext refers to root node of ydt application tree
+     */
+    public YdtAppContext getAppRootNode() {
+        return appRootNode;
+    }
+
+    /**
+     * Returns the data tree for given node identifier.
+     *
+     * @param id        Represents node identifier of YANG data tree node
+     * @param namespace namespace of the application requested by user
+     * @return YANG data tree node
+     */
+    private YdtNode moduleHandler(YangSchemaNodeIdentifier id,
+                                  String namespace) {
+
+        YangSchemaNode node = registry
+                .getYangSchemaNodeUsingSchemaName(id.getName());
+
+        if (node == null ||
+                namespace != null && !namespace.equals(node.getNameSpace())) {
+            curNode.errorHandler(errorMsg(
+                    FMT_NOT_EXIST, id.getName()), rootNode);
+        }
+
+        YdtNode newNode = new YdtSingleInstanceNode(id);
+        newNode.setYangSchemaNode(node);
+        id.setNameSpace(node.getNameSpace());
+        return newNode;
+    }
+
+    @Override
+    public void setRootTagAttributeMap(Map<String, String> attributeTag) {
+        rootTagAttributeMap = attributeTag;
+    }
+
+    @Override
+    public Map<String, String> getRootTagAttributeMap() {
+        if (rootTagAttributeMap != null) {
+            return ImmutableMap.copyOf(rootTagAttributeMap);
+        }
+        return null;
+    }
+
+    @Override
+    public void addChild(String name, String namespace) {
+        addChild(name, namespace, UNKNOWN, null, OTHER);
+    }
+
+    @Override
+    public void addChild(String name, String namespace, YdtType ydtType) {
+        addChild(name, namespace, ydtType, null);
+    }
+
+    @Override
+    public void addChild(String name, String namespace,
+                         YdtContextOperationType opType) {
+        addChild(name, namespace, UNKNOWN, opType, OTHER);
+    }
+
+    @Override
+    public void addChild(String name, String namespace, YdtType ydtType,
+                         YdtContextOperationType opType) {
+        RequestedCardinality cardinality = null;
+        switch (ydtType) {
+            case MULTI_INSTANCE_NODE:
+                cardinality = MULTI_INSTANCE;
+                break;
+            case SINGLE_INSTANCE_NODE:
+                cardinality = SINGLE_INSTANCE;
+                break;
+            default:
+                curNode.errorHandler(E_USE_ADDLEAF, rootNode);
+        }
+        addChild(name, namespace, cardinality, opType, OTHER);
+    }
+
+    /**
+     * Adds a last child to YANG data tree; this method is to be used by all
+     * protocols internally which are aware or unaware of the nature
+     * (single/multiple) of node.
+     *
+     * @param name        name of child to be added
+     * @param namespace   namespace of child to be added
+     * @param cardinality type of YANG data tree node operation
+     * @param opType      type of requested operation over a node
+     * @param callType    to identify the whether its a leaf or other node
+     */
+    private void addChild(String name, String namespace,
+                          RequestedCardinality cardinality,
+                          YdtContextOperationType opType,
+                          RequestedCallType callType) {
+
+        YdtNode childNode;
+        boolean isContextSwitch = false;
+        YangSchemaNode schemaNode = null;
+        YangSchemaNodeContextInfo contextInfo;
+        YangSchemaNode augmentingSchema = null;
+
+        YangSchemaNodeIdentifier id = new YangSchemaNodeIdentifier();
+        id.setName(name);
+
+        // Module/sub-module node handler.
+        if (curNode.equals(rootNode)) {
+            childNode = moduleHandler(id, namespace);
+        } else {
+
+            // If namespace given by user null, then take namespace from parent.
+            if (namespace == null) {
+                namespace = curNode.getYdtNodeIdentifier().getNameSpace();
+            }
+
+            id.setNameSpace(namespace);
+
+            /*
+             * Get the already exiting YDT node in YDT tree with same
+             * nodeIdentifier
+             */
+            childNode = curNode.getCollidingChild(id);
+
+            /*
+             * If colliding child doesn't exist ,
+             * then query yang data model for schema of given node.
+             */
+            if (childNode == null) {
+                /*
+                 * Get Yang Schema node context info which is having
+                 * YangSchemaNode and ContextSwitchedNode.
+                 */
+                contextInfo = curNode.getSchemaNodeContextInfo(id);
+
+                if (contextInfo.getContextSwitchedNode() != null) {
+                    augmentingSchema = appCurNode.getAugmentingSchemaNode(
+                            id, contextInfo);
+                    if (augmentingSchema != null) {
+                        /*
+                         * As two tree(YDT and YDT Application Tree) are getting
+                         * prepared in parallel, So  setting context switch
+                         * flag it will help ydt to keep the track whether
+                         * ydtApp tree also need to be traversed back to parent
+                         * or not with YDT tree traverse to parent call.
+                         */
+                        isContextSwitch = true;
+                    }
+                }
+                schemaNode = contextInfo.getSchemaNode();
+            } else {
+                /*
+                 * If colliding child exist , then will be leaf-list or list
+                 * If its leaf-list then return and add new requested
+                 * value/valueSet in same node else take yang data model
+                 * information from colliding child.
+                 */
+                if (childNode.getYdtType() == MULTI_INSTANCE_LEAF_VALUE_NODE) {
+                    curNode = childNode;
+                    return;
+                }
+                schemaNode = childNode.getYangSchemaNode();
+            }
+            childNode = YdtNodeFactory.getNode(id, schemaNode, cardinality,
+                                               callType);
+        }
+
+        opType = getValidOpType(opType, callType, schemaNode);
+
+        childNode.setYdtContextOperationType(opType);
+
+        curNode.addChild(childNode, true);
+
+        // Update parent ydt node map.
+        curNode.updateYdtMap(id, childNode);
+
+        processAppTree(opType, childNode, augmentingSchema, isContextSwitch);
+
+        // Updating the curNode.
+        curNode = childNode;
+    }
+
+    /**
+     * Processes application tree on the bases of requested ydt node.
+     *
+     * @param opType           user requested operation type
+     * @param childNode        requested ydt node
+     * @param augmentingSchema schema of last augmenting node
+     * @param isContextSwitch  true, for module node call; false for modules
+     *                         sub-node calls
+     */
+    private void processAppTree(
+            YdtContextOperationType opType, YdtNode childNode,
+            YangSchemaNode augmentingSchema, boolean isContextSwitch) {
+
+        if (augmentingSchema != null) {
+            if (!appCurNode.addSchemaToAppSet(augmentingSchema)) {
+                return;
+            }
+        }
+        if (opType == null) {
+            opType = curNode.getYdtContextOperationType();
+        } else {
+            // Updating operation type for parent nodes
+            appCurNode.updateAppOperationType(opType);
+        }
+
+        /*
+         * Create entry of module node in ydt app tree.
+         * Or if context switch happened then also add entry for same ydt
+         * node in the ydt application tree.
+         */
+        if (curNode.equals(rootNode) || isContextSwitch) {
+            addChildInAppTree(childNode, augmentingSchema, opType,
+                              isContextSwitch);
+
+            // Setting app tree node operation.
+            appCurNode.setOperationType(getAppOpTypeFromYdtOpType(opType));
+        }
+
+        // Updating the delete operation list in app tree.
+        if (opType == DELETE || opType == REMOVE) {
+            appCurNode.addDeleteNode(childNode);
+        }
+    }
+
+    /**
+     * Returns the valid operation type for requested ydt node after performing
+     * validation.
+     *
+     * @param opType     user requested operation type
+     * @param callType   to identify the whether its a leaf or other node
+     * @param schemaNode schema node of user requested ydt node
+     * @return operation type
+     */
+    private YdtContextOperationType getValidOpType(
+            YdtContextOperationType opType, RequestedCallType callType,
+            YangSchemaNode schemaNode) {
+
+        // Operation type not supported for leaf node.
+        if (callType == LEAF || (callType == RequestedCallType.MULTI_INSTANCE &&
+                schemaNode.getYangSchemaNodeType() ==
+                        YANG_MULTI_INSTANCE_LEAF_NODE)) {
+            return null;
+        }
+
+        // Reference for parent node operation type.
+        YdtContextOperationType parentOpType = curNode
+                .getYdtContextOperationType();
+
+        if (opType != null && parentOpType != null) {
+            validateOperationType(parentOpType, opType);
+        } else if (opType == null) {
+            opType = getOperationType(parentOpType);
+        }
+        return opType;
+    }
+
+    /**
+     * Returns the operation type for non leaf node.
+     * When "operation" attribute for current node is not specified or null,
+     * then the operation applied to the parent data node of the
+     * configuration is used. If no parent data node is available,
+     * then the default-operation'value is used.
+     * If default operation type is not set, merge will be taken as default
+     * operation type.
+     *
+     * @param parentOpType operation type of parent node
+     * @return operation type for current non leaf node
+     */
+    private YdtContextOperationType getOperationType(
+            YdtContextOperationType parentOpType) {
+
+        return parentOpType != null ? parentOpType :
+                (ydtDefaultOpType != null ? ydtDefaultOpType : MERGE);
+    }
+
+    /**
+     * Adds a last child to YANG app data tree.this method is to be used
+     * internally by other ydt interfaces.
+     *
+     * @param childNode       node to be added in tree
+     * @param schemaNode      last augmenting module node
+     * @param childOpType     operation type of node
+     * @param isContextSwitch true, for module node call; false for modules
+     *                        sub-node calls
+     */
+    private void addChildInAppTree(YdtNode childNode,
+                                   YangSchemaNode schemaNode,
+                                   YdtContextOperationType childOpType,
+                                   boolean isContextSwitch) {
+
+        YdtAppNodeOperationType opType;
+
+        DefaultYdtAppContext appContext = getAppContext(isContextSwitch);
+
+        // Add context switched child in ydt App tree.
+        appCurNode.addChild(appContext);
+        //Updating the curNode.
+        appCurNode = appContext;
+
+        // Get the app tree operation type from ydt operation type.
+        opType = getAppOpTypeFromYdtOpType(childOpType);
+
+        appCurNode.setAppData(childNode, schemaNode);
+
+        appCurNode.setOperationType(opType);
+
+        childNode.setAppContextSwitch();
+    }
+
+    /**
+     * Validates the various combination of operation type.
+     *
+     * @param parentOpType Reference for parent node operation type
+     * @param childOpType  type of YANG data tree node operation
+     */
+    private void validateOperationType(YdtContextOperationType parentOpType,
+                                       YdtContextOperationType childOpType) {
+
+        switch (parentOpType) {
+            case CREATE:
+                // Inside the create operation delete operation should not come.
+                if (childOpType == DELETE) {
+                    curNode.errorHandler(E_CREATE, rootNode);
+                }
+                break;
+            case DELETE:
+                // Inside the delete operation create operation should not come.
+                if (childOpType == CREATE) {
+                    curNode.errorHandler(E_DEL, rootNode);
+                }
+                break;
+            default:
+                //TODO check all possible scenario.
+        }
+    }
+
+    @Override
+    public void addLeaf(String name, String namespace, String value) {
+        addLeaf(name, namespace, value, null, UNKNOWN);
+    }
+
+    @Override
+    public void addLeaf(String name, String namespace, Set<String> valueSet) {
+        addLeaf(name, namespace, null, valueSet, MULTI_INSTANCE_LEAF);
+    }
+
+    /**
+     * Adds a last leaf with list of values/single value to YANG data tree.
+     * This method is used by all protocols which knows the nature
+     * (single/multiple) or not.
+     * Value of leaf can be null which indicates selection node in get
+     * operation.
+     *
+     * @param name        name of child to be added
+     * @param namespace   namespace of child to be added, if it's
+     *                    null, parent's
+     *                    namespace will be applied to child
+     * @param value       value of the child
+     * @param valueSet    list of value of the child
+     * @param cardinality type of YANG data tree node operation
+     */
+    private void addLeaf(String name, String namespace, String value,
+                         Set<String> valueSet,
+                         RequestedCardinality cardinality) {
+        addChild(name, namespace, cardinality, null, LEAF);
+
+        // After successful addition of child node updating the values in same.
+        if (value != null) {
+            curNode.addValue(value);
+        } else if (valueSet != null) {
+            curNode.addValueSet(valueSet);
+        }
+    }
+
+    @Override
+    public void traverseToParent() {
+        // If traverse back to parent for logical root node comes
+        if (curNode.equals(rootNode)) {
+            curNode.errorHandler(E_INVOKE_PARENT, rootNode);
+        }
+
+        // If node is of multiInstanceNode type then check key uniqueness.
+        if (curNode.getYdtType() == MULTI_INSTANCE_NODE) {
+            curNode.createKeyNodeList();
+        }
+
+        /*
+         * Check application switch for curNode if set,
+         * then traverseToParent in YDT application tree.
+         */
+        if (curNode.getParent().equals(rootNode) ||
+                curNode.getAppContextSwitch()) {
+            traverseToAppTreeParent();
+        }
+
+        /*
+         * Validate all multi Instance inside current context,
+         * This is not valid for leaf and leaf-list node.
+         */
+        if (curNode instanceof YdtMultiInstanceNode ||
+                curNode instanceof YdtSingleInstanceNode) {
+            curNode.validateMultiInstanceNode();
+        }
+
+        curNode = curNode.getParent();
+    }
+
+    /**
+     * Traverses up in YANG application tree to the parent node,
+     * This will be used when Ydt current context switch flag is set.
+     */
+    private void traverseToAppTreeParent() {
+        appCurNode = appCurNode.getParent();
+    }
+
+    @Override
+    public YdtContext getCurNode() {
+        return curNode;
+    }
+
+    @Override
+    public void setDefaultEditOperationType(
+            YdtContextOperationType opType) {
+        ydtDefaultOpType = opType;
+    }
+
+    @Override
+    public YdtExtendedContext getRootNode() {
+        return rootNode;
+    }
+
+    @Override
+    public YmsOperationType getYmsOperationType() {
+        return ymsOperationType;
+    }
+
+    @Override
+    public void addMultiInstanceChild(String name, String namespace,
+                                      List<String> keysValueList,
+                                      YdtContextOperationType opType) {
+        addChild(name, namespace, UNKNOWN, opType,
+                 RequestedCallType.MULTI_INSTANCE);
+        int inputCount = keysValueList.size();
+        int expectedCount;
+        if (curNode.getYdtType() == MULTI_INSTANCE_LEAF_VALUE_NODE) {
+            // After successful addition of child node updating
+            // the values in same.
+            // inputCount = curNode.getValueSet().size() + inputCount;
+            // checkElementCount(expectedCount, inputCount);
+            // TODO check the element count
+            for (String value : keysValueList) {
+                curNode.addValue(value);
+            }
+        } else if (curNode.getYdtType() == MULTI_INSTANCE_NODE) {
+            YangList yangListHolder = (YangList) curNode.getYangSchemaNode();
+            List<String> schemaKeyList = yangListHolder.getKeyList();
+            expectedCount = schemaKeyList.size();
+            checkElementCount(name, expectedCount, inputCount);
+
+            Iterator<String> sklIter = schemaKeyList.iterator();
+            Iterator<String> kvlIter = keysValueList.iterator();
+            String keyEleName;
+            while (kvlIter.hasNext()) {
+                String value = kvlIter.next();
+                keyEleName = sklIter.next();
+                addLeaf(keyEleName, namespace, value);
+                if (kvlIter.hasNext()) {
+                    traverseToParentWithoutValidation();
+                }
+            }
+            curNode = curNode.getParent();
+        } else {
+            curNode.errorHandler(E_MULTI_INS, rootNode);
+        }
+    }
+
+    /**
+     * Checks the user supplied list of argument match's the expected value
+     * or not.
+     *
+     * @param name     name of the parent list/leaf-list node
+     * @param expected count suppose to be
+     * @param actual   user supplied values count
+     */
+    private void checkElementCount(String name, int expected,
+                                   int actual) {
+        if (expected < actual) {
+            curNode.errorHandler(errorMsg(FMT_TOO_MANY, name, expected, actual),
+                                 rootNode);
+        } else if (expected > actual) {
+            curNode.errorHandler(errorMsg(FMT_TOO_FEW, name, expected, actual),
+                                 rootNode);
+        }
+    }
+
+    /**
+     * Adds a last child to YANG data tree, this method is to be used by
+     * YANG object builder sub-calls internally.
+     *
+     * @param opType type of requested operation over a node
+     * @return returns added ydt node in YDT tree
+     */
+    private YdtNode addExtendedChildNode(YdtContextOperationType opType,
+                                         YangSchemaNode schemaNode) {
+
+        YdtNode childNode;
+        YangSchemaNodeIdentifier id =
+                schemaNode.getYangSchemaNodeIdentifier();
+
+        childNode = YdtNodeFactory
+                .getYangSchemaNodeTypeSpecificContext(
+                        id, schemaNode.getYangSchemaNodeType());
+
+        childNode.setId(id);
+
+        childNode.setYangSchemaNode(schemaNode);
+
+        childNode.setYdtContextOperationType(opType);
+
+        curNode.addChild(childNode, true);
+
+        curNode = childNode;
+
+        return childNode;
+    }
+
+    @Override
+    public YdtExtendedContext addChild(YdtContextOperationType opType,
+                                       YangSchemaNode schemaNode) {
+        return addExtendedChildNode(opType, schemaNode);
+    }
+
+    @Override
+    public YdtExtendedContext addLeafList(Set<String> valueSet,
+                                          YangSchemaNode schemaNode) {
+        YdtNode childNode = addExtendedChildNode(null, schemaNode);
+
+        // After successful addition of child node updating the values in same.
+        childNode.addValueSetWithoutValidation(valueSet);
+        return childNode;
+    }
+
+    @Override
+    public YdtExtendedContext addLeaf(String value,
+                                      YangSchemaNode schemaNode) {
+        YdtNode childNode = addExtendedChildNode(null, schemaNode);
+
+        // After successful addition of child node updating the values in same.
+        childNode.addValueWithoutValidation(value);
+        return childNode;
+    }
+
+    @Override
+    public void traverseToParentWithoutValidation() {
+        // If traverse back to parent for logical root node comes
+        if (curNode.equals(rootNode)) {
+            curNode.errorHandler(E_INVOKE_PARENT, rootNode);
+        }
+        curNode = curNode.getParent();
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YangResponseWorkBench.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YangResponseWorkBench.java
new file mode 100644
index 0000000..99342d7
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YangResponseWorkBench.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yms.ydt.YdtContext;
+import org.onosproject.yms.ydt.YdtResponse;
+import org.onosproject.yms.ydt.YmsOperationExecutionStatus;
+import org.onosproject.yms.ydt.YmsOperationType;
+
+public class YangResponseWorkBench implements YdtResponse {
+
+    /*
+     * YDT root node context.
+     */
+    private YdtContext rootNode;
+
+    /*
+     * YMS operation execution status.
+     */
+    private YmsOperationExecutionStatus status;
+
+    /*
+     * YMS operation type.
+     */
+    private YmsOperationType ymsOperationType;
+
+    /**
+     * Creates an instance of YangResponseWorkBench which is use to
+     * initialize rootNode and childNode.
+     *
+     * @param ydtContext root node context
+     * @param exeStatus  YMS operation execution status
+     * @param opType     YMS operation type
+     */
+    public YangResponseWorkBench(YdtContext ydtContext,
+                                 YmsOperationExecutionStatus exeStatus,
+                                 YmsOperationType opType) {
+        rootNode = ydtContext;
+        status = exeStatus;
+        ymsOperationType = opType;
+    }
+
+    @Override
+    public YmsOperationExecutionStatus getYmsOperationResult() {
+        return status;
+    }
+
+    @Override
+    public YdtContext getRootNode() {
+        return rootNode;
+    }
+
+    @Override
+    public YmsOperationType getYmsOperationType() {
+        return ymsOperationType;
+    }
+
+    /**
+     * Sets root node.
+     *
+     * @param rootNode root node
+     */
+    public void setRootNode(YdtContext rootNode) {
+        this.rootNode = rootNode;
+    }
+
+    /**
+     * Sets YMS operation execution status.
+     *
+     * @param status YMS operation execution status
+     */
+    public void setStatus(YmsOperationExecutionStatus status) {
+        this.status = status;
+    }
+
+    /**
+     * Sets YMS operation type.
+     *
+     * @param ymsOperationType YMS operation type
+     */
+    public void setYmsOperationType(YmsOperationType ymsOperationType) {
+        this.ymsOperationType = ymsOperationType;
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtAppContext.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtAppContext.java
new file mode 100644
index 0000000..c845221
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtAppContext.java
@@ -0,0 +1,223 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeContextInfo;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+import org.onosproject.yms.ydt.YdtContext;
+import org.onosproject.yms.ydt.YdtContextOperationType;
+
+import java.util.List;
+
+/**
+ * Abstraction of an entity which represents YANG application data tree context
+ * information. This context information will be used by protocol to obtain
+ * the information associated with YDT application node. This is used when
+ * protocol is walking the application data tree in both visitor and listener
+ * mechanism.
+ */
+public interface YdtAppContext {
+
+    /**
+     * Returns the context of parent node.
+     *
+     * @return context of parent node
+     */
+    YdtAppContext getParent();
+
+    /**
+     * Sets the context of parent node.
+     *
+     * @param parent node
+     */
+    void setParent(YdtAppContext parent);
+
+    /**
+     * Returns the context of first child.
+     *
+     * @return context of first child
+     */
+    YdtAppContext getFirstChild();
+
+    /**
+     * Sets the context of first child.
+     *
+     * @param child node
+     */
+    void setChild(YdtAppContext child);
+
+    /**
+     * Returns the context of last child.
+     *
+     * @return context of last child
+     */
+    YdtAppContext getLastChild();
+
+    /**
+     * Sets the context of last child.
+     *
+     * @param child node
+     */
+    void setLastChild(YdtAppContext child);
+
+    /**
+     * Returns the context of next sibling.
+     *
+     * @return context of next sibling
+     */
+    YdtAppContext getNextSibling();
+
+    /**
+     * Sets the context of next sibling.
+     *
+     * @param nextSibling node
+     */
+    void setNextSibling(YdtAppContext nextSibling);
+
+    /**
+     * Returns the context of previous sibling.
+     *
+     * @return context of previous sibling
+     */
+    YdtAppContext getPreviousSibling();
+
+    /**
+     * Sets the context of previous sibling.
+     *
+     * @param preSibling node
+     */
+    void setPreviousSibling(YdtAppContext preSibling);
+
+    /**
+     * Returns the app tree operation type.
+     *
+     * @return app tree operation type
+     */
+    YdtAppNodeOperationType getOperationType();
+
+    /**
+     * Set the app tree operation type.
+     *
+     * @param opType app tree operation type
+     */
+    void setOperationType(YdtAppNodeOperationType opType);
+
+    /**
+     * Returns the list of nodes with operation type delete.
+     *
+     * @return list of nodes with operation type delete
+     */
+    List<YdtContext> getDeleteNodes();
+
+    /**
+     * Adds the ydt node with operation type delete in module delete node list.
+     *
+     * @param node ydt node with operation type delete/remove
+     */
+    void addDeleteNode(YdtNode node);
+
+    /**
+     * Returns application's root ydtContext.
+     *
+     * @return YdtContext of application root node
+     */
+    YdtContext getModuleContext();
+
+    /**
+     * Sets the application's ydtContext.
+     *
+     * @param moduleNode application's ydtContext
+     */
+    void setModuleContext(YdtContext moduleNode);
+
+    /**
+     * Returns the YangSchemaNode of augmenting application.
+     *
+     * @return YangSchemaNode of augmenting application
+     */
+    YangSchemaNode getAugmentingSchemaNode();
+
+    /**
+     * Sets the YangSchemaNode of augmenting application root node.
+     *
+     * @param schemaNode YangSchemaNode of augmenting application module
+     */
+    void setAugmentingSchemaNode(YangSchemaNode schemaNode);
+
+    /**
+     * Adds a last child to ydt application data tree.
+     *
+     * @param newChild name of child to be added
+     */
+    void addChild(YdtAppContext newChild);
+
+    /**
+     * Returns augmenting node module yang schema node.
+     *
+     * @param id          schema node identifier
+     * @param contextInfo Yang Schema node context info
+     *                    which is having YangSchemaNode and
+     *                    ContextSwitchedNode
+     * @return augmenting node module yang schema node
+     */
+    YangSchemaNode getAugmentingSchemaNode(
+            YangSchemaNodeIdentifier id,
+            YangSchemaNodeContextInfo contextInfo);
+
+    /**
+     * Updates the app tree operation type.
+     * <p>
+     * If earlier operation type was OTHER_EDIT and now operation type came as
+     * DELETE_ONLY or vice-versa, then update operation type to BOTH.
+     *
+     * @param opType ydt current context operation type
+     */
+    void updateAppOperationType(YdtContextOperationType opType);
+
+    /**
+     * Sets the application data for given request. If in requested parameters
+     * schemaNode is not null then appData will be set with
+     * augmentedSchemaData else with moduleSchemaData object.
+     *
+     * @param moduleNode module node of requested app
+     * @param schemaNode augmented schema node of requested context
+     */
+    void setAppData(YdtNode moduleNode, YangSchemaNode schemaNode);
+
+    /**
+     * Returns the app data for current context.
+     *
+     * @return app data
+     */
+    AppData getAppData();
+
+    /**
+     * Returns the yang schema for requested node.
+     *
+     * @return schema node
+     */
+    YangSchemaNode getYangSchemaNode();
+
+    /**
+     * Adds the given schema node in to application set.
+     *
+     * @param schemaNode schema node to be added
+     * @return true for success; false otherwise
+     */
+    boolean addSchemaToAppSet(YangSchemaNode schemaNode);
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtAppNodeOperationType.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtAppNodeOperationType.java
new file mode 100644
index 0000000..4880edc
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtAppNodeOperationType.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+/**
+ * Represents type of YANG data tree node operation.
+ */
+public enum YdtAppNodeOperationType {
+
+    /**
+     * Type of YANG application node operation for below action:
+     * The application containing this attribute has edit operation
+     * type as delete/remove in its complete ydtTree.
+     */
+    DELETE_ONLY,
+
+    /**
+     * Type of YANG application node operation for below action:
+     * The application containing this attribute has edit operation
+     * type other than delete/remove in its complete ydtTree.
+     */
+    OTHER_EDIT,
+
+    /**
+     * Type of YANG application node operation for below action:
+     * The application containing this attribute has edit operation
+     * type of combination of any edit operation type in its complete ydtTree.
+     */
+    BOTH
+}
+
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtConstants.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtConstants.java
new file mode 100644
index 0000000..2063093
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtConstants.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+/**
+ * Represents common constant utility for YANG data tree.
+ */
+final class YdtConstants {
+
+    //No instantiation.
+    private YdtConstants() {
+    }
+
+    /**
+     * Error formatting string for duplicate entries found in ydt.
+     */
+    public static final String FMT_DUP_ENTRY = "Duplicate entry with name %s.";
+
+    /**
+     * Returns the error string by filling the parameters in the given
+     * formatted error string.
+     *
+     * @param fmt    error format string
+     * @param params parameters to be filled in formatted string
+     * @return error string
+     */
+    public static String errorMsg(String fmt, Object... params) {
+        return String.format(fmt, params);
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedBuilder.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedBuilder.java
new file mode 100644
index 0000000..ea9c9f3d
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedBuilder.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yms.ydt.YdtBuilder;
+import org.onosproject.yms.ydt.YdtContextOperationType;
+
+import java.util.Set;
+
+/**
+ * Abstraction of an entity which represents extension of YDT builder
+ * required by internal sub modules.
+ */
+public interface YdtExtendedBuilder extends YdtBuilder {
+
+    /**
+     * Adds a last child to YANG data tree; this method is to be used by
+     * YANG object builder.
+     *
+     * @param yangSchemaNode schema node from YANG metadata
+     * @param opType         type of requested operation over a node
+     * @return YDT context
+     */
+    YdtExtendedContext addChild(YdtContextOperationType opType,
+                                YangSchemaNode yangSchemaNode);
+
+    /**
+     * Adds a last leaf list to YANG data tree; this method is to be used by
+     * YANG object builder.
+     *
+     * @param valueSet       list of value of the child
+     * @param yangSchemaNode schema node from YANG metadata
+     * @return YDT context
+     */
+    YdtExtendedContext addLeafList(Set<String> valueSet,
+                                   YangSchemaNode yangSchemaNode);
+
+    /**
+     * Adds a last leaf to YANG data tree; this method is to be used by
+     * YANG object builder.
+     *
+     * @param value          value of the child
+     * @param yangSchemaNode schema node from YANG metadata
+     * @return YDT context
+     */
+    YdtExtendedContext addLeaf(String value, YangSchemaNode yangSchemaNode);
+
+    /**
+     * Traverses up in YANG data tree to the parent node, it is to be used when
+     * protocol is using extended context type and wanted to traverse
+     * up the tree without doing any validation.
+     */
+    void traverseToParentWithoutValidation();
+
+    @Override
+    YdtExtendedContext getRootNode();
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedContext.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedContext.java
new file mode 100644
index 0000000..3668de8
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedContext.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeContextInfo;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+import org.onosproject.yms.ydt.YdtContext;
+import org.onosproject.yms.ydt.YdtContextOperationType;
+
+/**
+ * Abstraction of an entity which represents application related information
+ * maintained in YDT.
+ */
+public interface YdtExtendedContext extends YdtContext {
+
+    /**
+     * Returns the application stored information. Application type is used to
+     * identify application.
+     *
+     * @param appType application type
+     * @return application information
+     */
+    Object getAppInfo(AppType appType);
+
+    /**
+     * Sets application stored information. Application type is used to
+     * identify application.
+     *
+     * @param appType application type
+     * @param object  application information object
+     */
+    void addAppInfo(AppType appType, Object object);
+
+    /**
+     * Returns child schema node context information. It is used by YMS to
+     * obtain the child schema corresponding to data node identifier.
+     *
+     * @param id represents a identifier of YANG data tree node
+     * @return YANG data node context information
+     */
+    YangSchemaNodeContextInfo getSchemaNodeContextInfo(
+            YangSchemaNodeIdentifier id);
+
+    /**
+     * Returns schema node from data model for curNode.
+     *
+     * @return yang schema node
+     */
+    YangSchemaNode getYangSchemaNode();
+
+    /**
+     * Returns YDT current extended context operation type.
+     *
+     * @return operation type
+     */
+    YdtContextOperationType getYdtContextOperationType();
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedListener.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedListener.java
new file mode 100644
index 0000000..333f3ef
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedListener.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+
+import org.onosproject.yms.ydt.YdtListener;
+
+/**
+ * Abstraction of an entity which provide call back methods which are called
+ * by YDT extended walker while walking the YANG data tree.
+ * <p>
+ * This interface needs to be implemented by protocol implementing listener's
+ * based call backs while YDT walk, and update application specific information
+ * in data node.
+ */
+public interface YdtExtendedListener extends YdtListener {
+
+    /**
+     * YANG data tree node's entry, it will be called during a node entry.
+     * <p>
+     * All the related information about the node can be obtain from the YDT
+     * context. Also it can be used to maintain / query application specific
+     * information.
+     *
+     * @param ydtExtendedContext YANG data tree context
+     */
+    void enterYdtNode(YdtExtendedContext ydtExtendedContext);
+
+    /**
+     * YANG data tree node's exit, it will be called during a node exit.
+     * <p>
+     * All the related information about the node can be obtain from the YDT
+     * context. Also it can be used to maintain / query application specific
+     * information.
+     *
+     * @param ydtExtendedContext YANG data tree context
+     */
+    void exitYdtNode(YdtExtendedContext ydtExtendedContext);
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedWalker.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedWalker.java
new file mode 100644
index 0000000..f3bfea3
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtExtendedWalker.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yms.ydt.YdtWalker;
+
+/**
+ * Abstraction of an entity which provides interfaces for YDT extended walker.
+ */
+public interface YdtExtendedWalker extends YdtWalker {
+
+    /**
+     * Walks the YANG data tree. Protocols implements YDT listener service and
+     * walks YDT tree with input as implemented object.
+     * YDT walker provides call backs to implemented methods.
+     *
+     * @param ydtListener YDT listener implemented by the protocol
+     * @param rootNode    root node of YDT
+     */
+    void walk(YdtExtendedListener ydtListener, YdtExtendedContext rootNode);
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtMultiInstanceLeafNode.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtMultiInstanceLeafNode.java
new file mode 100644
index 0000000..955852d
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtMultiInstanceLeafNode.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import com.google.common.collect.ImmutableSet;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.onosproject.yms.app.ydt.YdtConstants.errorMsg;
+import static org.onosproject.yms.ydt.YdtType.MULTI_INSTANCE_LEAF_VALUE_NODE;
+
+/**
+ * Represents YDT multi instance leaf node which can hold multiple values, it
+ * is atomic element and doesn't have any child.
+ */
+class YdtMultiInstanceLeafNode extends YdtNode {
+
+    // ydt formatted error string
+    private static final String FMT_DUP_ENTRY =
+            "Duplicate entry found under %s leaf-list node.";
+
+    /**
+     * Set of values.
+     */
+    private final Set<String> valueSet = new HashSet<>();
+
+    /**
+     * Creates a YANG multi instance leaf node.
+     *
+     * @param id node identifier of YDT multi instance node
+     */
+    protected YdtMultiInstanceLeafNode(YangSchemaNodeIdentifier id) {
+        super(MULTI_INSTANCE_LEAF_VALUE_NODE, id);
+    }
+
+    @Override
+    public Set<String> getValueSet() {
+        return ImmutableSet.copyOf(valueSet);
+    }
+
+    @Override
+    public void addValue(String value) {
+        // check the value against corresponding data-type.
+        try {
+            getYangSchemaNode().isValueValid(value);
+        } catch (Exception e) {
+            errorHandler(e.getLocalizedMessage(), this);
+        }
+        addValueToValueSet(value);
+    }
+
+    /**
+     * Adds value in the current node valueSet, after successful validation of
+     * the value.
+     *
+     * @param value value to be added
+     */
+    private void addValueToValueSet(String value) {
+
+        if (!valueSet.add(value)) {
+            errorHandler(errorMsg(FMT_DUP_ENTRY,
+                                  getYdtNodeIdentifier().getName()), this);
+        }
+    }
+
+    @Override
+    public void addValueSet(Set valueSet) {
+        String value = null;
+        // Check the value against corresponding data-type.
+        for (Object aValueSet : valueSet) {
+
+            try {
+                value = String.valueOf(aValueSet);
+                getYangSchemaNode().isValueValid(value);
+            } catch (DataModelException e) {
+                errorHandler(e.getLocalizedMessage(), this);
+            }
+            addValueToValueSet(value);
+        }
+    }
+
+    @Override
+    public void addValueWithoutValidation(String value) {
+        valueSet.add(value);
+    }
+
+    @Override
+    public void addValueSetWithoutValidation(Set valueSet) {
+        this.valueSet.clear();
+        this.valueSet.addAll(valueSet);
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtMultiInstanceNode.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtMultiInstanceNode.java
new file mode 100644
index 0000000..a24772b
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtMultiInstanceNode.java
@@ -0,0 +1,125 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import com.google.common.collect.ImmutableList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+import org.onosproject.yms.ydt.YdtContext;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import static org.onosproject.yms.app.ydt.YdtConstants.errorMsg;
+import static org.onosproject.yms.ydt.YdtType.MULTI_INSTANCE_NODE;
+
+
+/**
+ * Represents a multi instance node in YANG data tree.
+ */
+public class YdtMultiInstanceNode extends YdtNode {
+
+    // ydt formatted error string
+    private static final String FMT_MISSING_KEY =
+            "%s is missing some of the keys of %s.";
+
+    /*
+     * Reference for list of key element's ydtContext.
+     */
+    private List<YdtContext> keyNodeList = new ArrayList<>();
+
+    /*
+     * Reference for composite key string for multi Instance Node..
+     */
+    private String compositeKey;
+
+    /**
+     * Creates a YANG multi instance node object.
+     *
+     * @param id node identifier of YDT multi instance node .
+     */
+    protected YdtMultiInstanceNode(YangSchemaNodeIdentifier id) {
+        super(MULTI_INSTANCE_NODE, id);
+    }
+
+    /**
+     * Returns the composite key string for current multi instance node.
+     *
+     * @return composite key string
+     */
+    public String getCompositeKey() {
+        return compositeKey;
+    }
+
+    /**
+     * Returns the list of key element's ydtContext.
+     *
+     * @return list of key element's ydtContext
+     */
+    public List<YdtContext> getKeyNodeList() {
+        return ImmutableList.copyOf(keyNodeList);
+    }
+
+    @Override
+    public void createKeyNodeList() {
+        YangList yangListHolder = (YangList) getYangSchemaNode();
+        List<String> schemaKeyList = yangListHolder.getKeyList();
+
+        /*
+         * If key element not defined in schema or config is false then
+         * return no need to do create key list.
+         */
+        if (schemaKeyList == null || !yangListHolder.isConfig()) {
+            return;
+        }
+
+        StringBuilder ksb = new StringBuilder();
+
+        // Iterator for schema key name list.
+        Iterator<String> sklItr = schemaKeyList.iterator();
+
+        List<YdtContext> nodeList = new ArrayList<>();
+
+        YangSchemaNodeIdentifier id = new YangSchemaNodeIdentifier();
+        id.setNameSpace(getYdtNodeIdentifier().getNameSpace());
+        // This loop should run while schema key list is not finished
+        while (sklItr.hasNext()) {
+            String name = sklItr.next();
+            id.setName(name);
+            List<YdtNode<YdtMultiInstanceNode>> collidingChild =
+                    (List<YdtNode<YdtMultiInstanceNode>>) ydtNodeMap.get(id);
+
+            if (collidingChild == null) {
+                errorHandler(errorMsg(FMT_MISSING_KEY,
+                                      yangListHolder.getParent().getName(),
+                                      yangListHolder.getName()), this);
+            }
+
+            YdtNode<YdtMultiInstanceNode> ydtNode = collidingChild.get(0);
+            /*
+             * Preparing composite key string by concatenating values of
+             * all the key leaf.
+             */
+            ksb.append(ydtNode.getValue());
+            nodeList.add(ydtNode);
+        }
+        //Setting te key object in List.
+        keyNodeList = nodeList;
+        compositeKey = ksb.toString();
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtNode.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtNode.java
new file mode 100644
index 0000000..c3d4b87
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtNode.java
@@ -0,0 +1,707 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeContextInfo;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+import org.onosproject.yms.ydt.YdtContext;
+import org.onosproject.yms.ydt.YdtContextOperationType;
+import org.onosproject.yms.ydt.YdtExtendedInfoType;
+import org.onosproject.yms.ydt.YdtType;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import static org.onosproject.yms.app.ydt.YdtConstants.errorMsg;
+
+/**
+ * Represents implementation of interfaces to build and obtain YANG data tree
+ * which is data (sub)instance representation, abstract of protocol.
+ */
+public abstract class YdtNode<T> implements YdtExtendedContext, Cloneable {
+
+    // ydt formatted error string
+    private static final String FMT_UNI_KEY =
+            "Some of the key elements are not unique in %s.";
+    private static final String FMT_KLIST_STR =
+            "List of key cannot be created for leaf and leaf-list %s node.";
+    private static final String FMT_VAL_N =
+            "Value cannot be set in non leaf %s node.";
+    private static final String FMT_VAL_NS =
+            "ValueSet cannot be set in non leaf-list %s node.";
+    private static final String FMT_VAL_IN =
+            "Value cannot be invoke from non leaf %s node.";
+    private static final String FMT_VAL_INS =
+            "ValueSet cannot be invoke from non leaf-list %s node";
+    private static final String FMT_MANY_INS =
+            "Too many instances of %s. Expected maximum instances %d.";
+    private static final String FMT_FEW_INS =
+            "Too few instances of %s. Expected minimum instances %d.";
+
+    // ydt error string
+    private static final String E_EXIST = "Node is already part of a tree";
+    private static final String E_ATOMIC =
+            "Child to be added is not atomic, it already has a child";
+    private static final String E_SIB =
+            "Child to be added is not atomic, it already has a next sibling";
+    private static final String E_PRE =
+            "Child to be added is not atomic, it already has a previous " +
+                    "sibling";
+    private static final String E_SUPPORT = "Requested node type not supported";
+
+    /*
+     * Parent reference.
+     */
+    private YdtNode parent;
+
+    /*
+     * First child reference.
+     */
+    private YdtNode child;
+
+    /*
+     * Next sibling reference.
+     */
+    private YdtNode nextSibling;
+
+    /*
+     * Previous sibling reference.
+     */
+    private YdtNode previousSibling;
+
+    /*
+     * Last child reference.
+     */
+    private YdtNode lastChild;
+
+    /*
+     * Type of node.
+     */
+    private YdtType ydtType;
+
+    /*
+     * Flag to keep the track of context switch,
+     * if set then traverse back to parent in YDT app tree else no need.
+     */
+    private boolean isContextSwitch;
+
+    /*
+     * YDT extended information.
+     */
+    private T ydtExtendedInfo;
+
+    /*
+     * YDT extended information type.
+     */
+    private YdtExtendedInfoType ydtExtendedInfoType;
+
+    /*
+     * Ydt map to keep the track of node added in YDT.
+     */
+    final Map<YangSchemaNodeIdentifier, List<YdtNode<T>>> ydtNodeMap =
+            new HashMap<>();
+
+    /*
+     * Reference for data-model schema node.
+     */
+    private YangSchemaNode yangSchemaNode;
+
+    /*
+     * Reference for ydt node operation type.
+     */
+    private YdtContextOperationType ydtContextOperationType;
+
+    /*
+     * Key object for ydtNodeMap.
+     */
+    private YangSchemaNodeIdentifier id;
+
+    /*
+     * Ydt map to keep the track of application information object
+     * with respective type.
+     */
+    private final Map<AppType, Object> ydtAppInfoMap = new HashMap<>();
+
+    private YdtContext clonedNode;
+
+    /**
+     * Returns the cloned ydt node.
+     *
+     * @return clonedNode cloned ydt node
+     */
+    public YdtContext getClonedNode() {
+        return clonedNode;
+    }
+
+    /**
+     * Sets the cloned node.
+     *
+     * @param clonedNode cloned ydt node
+     */
+    public void setClonedNode(YdtContext clonedNode) {
+        this.clonedNode = clonedNode;
+    }
+
+    @Override
+    public String getName() {
+        return id.getName();
+    }
+
+    @Override
+    public String getNamespace() {
+        return id.getNameSpace();
+    }
+
+    @Override
+    public <T> T getYdtContextExtendedInfo() {
+        return (T) ydtExtendedInfo;
+    }
+
+    @Override
+    public YdtExtendedInfoType getYdtExtendedInfoType() {
+        return ydtExtendedInfoType;
+    }
+
+    @Override
+    public YdtType getYdtType() {
+        return ydtType;
+    }
+
+    @Override
+    public YdtNode getParent() {
+        return parent;
+    }
+
+    @Override
+    public YdtNode getFirstChild() {
+        return child;
+    }
+
+    @Override
+    public YdtNode getNextSibling() {
+        return nextSibling;
+    }
+
+    public YangSchemaNode getYangSchemaNode() {
+        return yangSchemaNode;
+    }
+
+    @Override
+    public YdtNode getLastChild() {
+        return lastChild;
+    }
+
+    @Override
+    public Object getAppInfo(AppType appType) {
+        return ydtAppInfoMap.get(appType);
+    }
+
+    @Override
+    public void addAppInfo(AppType appType, Object object) {
+        ydtAppInfoMap.put(appType, object);
+    }
+
+    @Override
+    public YangSchemaNodeContextInfo getSchemaNodeContextInfo(
+            YangSchemaNodeIdentifier id) {
+        try {
+            return getYangSchemaNode().getChildSchema(id);
+        } catch (DataModelException e) {
+            errorHandler(e.getLocalizedMessage(), this);
+        }
+        return null;
+    }
+
+    /**
+     * Adds the given value to the non single instance leaf node.
+     * <p>
+     * This default implementation throws an exception stating that
+     * the value cannot be added. Subclasses may override this method
+     * to provide the correct behavior for their specific implementation.
+     *
+     * @param value value in a single instance node
+     */
+    public void addValue(String value) {
+        errorHandler(
+                errorMsg(FMT_VAL_N, getYdtNodeIdentifier().getName()), this);
+    }
+
+    /**
+     * Creates the list of key element's of multi instance node.
+     * this will not be applicable on leaf and leaf-list node.
+     */
+    public void createKeyNodeList() {
+        errorHandler(errorMsg(
+                FMT_KLIST_STR, getYdtNodeIdentifier().getName()), this);
+    }
+
+    /**
+     * Adds the given value to the non single instance leaf node.
+     * <p>
+     * This default implementation throws an exception stating that
+     * the value cannot be added. Subclasses may override this method
+     * to provide the correct behavior for their specific implementation.
+     * This will be applicable in case of call from SBI so no need
+     * to validate the value.
+     *
+     * @param value value in a single instance leaf node
+     */
+    public void addValueWithoutValidation(String value) {
+        errorHandler(
+                errorMsg(FMT_VAL_N, getYdtNodeIdentifier().getName()), this);
+    }
+
+    /**
+     * Adds the given valueSet to the non multi instance leaf node.
+     * <p>
+     * This default implementation throws an exception stating that
+     * the value cannot be added. Subclasses may override this method
+     * to provide the correct behavior for their specific implementation.
+     *
+     * @param valueSet valueSet in a multi instance leaf node
+     */
+    public void addValueSet(Set<String> valueSet) {
+        errorHandler(
+                errorMsg(FMT_VAL_NS, getYdtNodeIdentifier().getName()), this);
+    }
+
+    /**
+     * Adds the given valueSet to the non multi instance leaf node.
+     * <p>
+     * This default implementation throws an exception stating that
+     * the value cannot be added. Subclasses may override this method
+     * to provide the correct behavior for their specific implementation.
+     * This will be applicable in case of call from SBI so no need
+     * to validate the value.
+     *
+     * @param valueSet valueSet in a multi instance leaf node
+     */
+    public void addValueSetWithoutValidation(Set<String> valueSet) {
+        errorHandler(
+                errorMsg(FMT_VAL_NS, getYdtNodeIdentifier().getName()), this);
+    }
+
+    /**
+     * Validates requested node allowed to have duplicate entry or not.
+     * <p>
+     * This default implementation throws an exception stating that
+     * the duplicate entry found. Subclasses may override this method
+     * to provide the correct behavior for their specific implementation.
+     */
+    public void validDuplicateEntryProcessing() {
+    }
+
+    /**
+     * Returns already existing YdtNode in Ydt tree with same nodeIdentifier.
+     *
+     * @param id represents a identifier of YANG data tree node
+     * @return YDT node
+     */
+    public YdtNode getCollidingChild(YangSchemaNodeIdentifier id) {
+
+        // Find the key in YDT map for getting the colliding node.
+        List<YdtNode<T>> collidingChild = ydtNodeMap.get(id);
+
+        /*
+         * If colliding child exist then process colliding node in respective
+         * YDT node type.
+         */
+        if (collidingChild != null) {
+            collidingChild.get(0).validDuplicateEntryProcessing();
+            return collidingChild.get(0);
+        }
+
+        return null;
+    }
+
+    /**
+     * Creates a specific type of node.
+     *
+     * @param type of YDT node
+     * @param id   node identifier of the YDT node
+     */
+    YdtNode(YdtType type, YangSchemaNodeIdentifier id) {
+        ydtType = type;
+        setId(id);
+    }
+
+    /**
+     * Sets the parent of node.
+     *
+     * @param parent node
+     */
+    public void setParent(YdtNode parent) {
+        this.parent = parent;
+    }
+
+    /**
+     * Sets the first instance of a child node.
+     *
+     * @param child is only child to be set
+     */
+    public void setChild(YdtNode child) {
+        this.child = child;
+    }
+
+    /**
+     * Sets the next sibling of node.
+     *
+     * @param sibling YANG node
+     */
+    public void setNextSibling(YdtNode sibling) {
+        nextSibling = sibling;
+    }
+
+    /**
+     * Returns the previous sibling of a node.
+     *
+     * @return previous sibling of a node
+     */
+    public YdtNode getPreviousSibling() {
+        return previousSibling;
+    }
+
+    /**
+     * Sets the previous sibling.
+     *
+     * @param previousSibling points to predecessor sibling
+     */
+    public void setPreviousSibling(YdtNode previousSibling) {
+        this.previousSibling = previousSibling;
+    }
+
+    @Override
+    public String getValue() {
+        errorHandler(
+                errorMsg(FMT_VAL_IN, getYdtNodeIdentifier().getName()), this);
+        return null;
+    }
+
+    @Override
+    public Set<String> getValueSet() {
+        errorHandler(
+                errorMsg(FMT_VAL_INS, getYdtNodeIdentifier().getName()), this);
+        return null;
+    }
+
+    /**
+     * Sets the data-model node reference for of a given node.
+     *
+     * @param yangSchemaNode YANG data node
+     */
+    public void setYangSchemaNode(YangSchemaNode yangSchemaNode) {
+        this.yangSchemaNode = yangSchemaNode;
+    }
+
+    /**
+     * Sets the last instance of a child node.
+     *
+     * @param child is last child to be set
+     */
+    public void setLastChild(YdtNode child) {
+        lastChild = child;
+    }
+
+    /**
+     * Returns object node identifier.
+     *
+     * @return node identifier
+     */
+    public YangSchemaNodeIdentifier getYdtNodeIdentifier() {
+        return id;
+    }
+
+    /**
+     * Sets object node identifier.
+     *
+     * @param id node identifier
+     */
+    public void setId(YangSchemaNodeIdentifier id) {
+        this.id = id;
+    }
+
+    /**
+     * Adds a child node.
+     * The children sibling list will be sorted based on node
+     * type. This will add single child or sub-tree based on isAtomic flag.
+     *
+     * @param newChild refers to a new child to be added
+     * @param isAtomic boolean flag to maintain atomicity of the current node
+     * @throws YdtException in case of violation of any YDT rule
+     */
+    public void addChild(YdtContext newChild, boolean isAtomic)
+            throws YdtException {
+
+        if (!(newChild instanceof YdtNode)) {
+            errorHandler(errorMsg(E_SUPPORT), this);
+        }
+
+        YdtNode node = (YdtNode) newChild;
+
+        if (node.getParent() == null) {
+            node.setParent(this);
+        } else if (!node.getParent().equals(this)) {
+            errorHandler(errorMsg(E_EXIST), this);
+        }
+
+        if (node.getFirstChild() != null && isAtomic) {
+            errorHandler(errorMsg(E_ATOMIC), this);
+        }
+
+        if (node.getNextSibling() != null) {
+            errorHandler(errorMsg(E_SIB), this);
+        }
+
+        if (node.getPreviousSibling() != null) {
+            errorHandler(errorMsg(E_PRE), this);
+        }
+
+        // If new node needs to be added as first child.
+        if (getFirstChild() == null) {
+            setChild(node);
+            setLastChild(node);
+            return;
+        }
+
+        // If new node needs to be added as last child.
+        YdtNode curNode = getLastChild();
+        curNode.setNextSibling(node);
+        node.setPreviousSibling(curNode);
+        setLastChild(node);
+    }
+
+    @Override
+    public YdtContextOperationType getYdtContextOperationType() {
+        return ydtContextOperationType;
+    }
+
+    /**
+     * Sets type of yang data tree node operation.
+     *
+     * @param opType type of yang data tree node operation
+     */
+    public void setYdtContextOperationType(YdtContextOperationType opType) {
+        ydtContextOperationType = opType;
+    }
+
+    /**
+     * Updates ydt map of current context parent node.
+     *
+     * @param id   object node identifier
+     * @param node ydt node for which map need to be updated
+     */
+    public void updateYdtMap(YangSchemaNodeIdentifier id, YdtNode node) {
+        List<YdtNode<T>> list = ydtNodeMap.get(id);
+        if (list == null) {
+            list = new ArrayList<>();
+            ydtNodeMap.put(id, list);
+        }
+        list.add(node);
+    }
+
+    /**
+     * Returns the flag for node if context switch.
+     *
+     * @return isContextSwitch flag of a node
+     */
+    public boolean getAppContextSwitch() {
+        return isContextSwitch;
+    }
+
+    /**
+     * Sets the flag to keep the track of context switch.
+     * If it is set then when YDT get traverToParent then
+     * traverse back to parent in YDT application tree.
+     */
+    public void setAppContextSwitch() {
+        isContextSwitch = true;
+    }
+
+    /**
+     * Validates all multi Instance inside current context.
+     */
+    public void validateMultiInstanceNode() {
+
+        // Set for checking whether input string is unique or not.
+        Set<String> keyStringSet = new HashSet<>();
+
+        // Iterating over values in map and find multi instance node list only.
+        for (List<YdtNode<T>> ydtNodeList : ydtNodeMap.values()) {
+            validateInstances(keyStringSet, ydtNodeList);
+        }
+    }
+
+    /**
+     * Checks for any duplicate list entries.
+     *
+     * @param keyStringSet set to validate the composite key of an instance
+     * @param ydtNodeList  list of entries
+     */
+    private void validateInstances(Set<String> keyStringSet,
+                                   List<YdtNode<T>> ydtNodeList) {
+        // Clearing the set.
+        keyStringSet.clear();
+
+        if (ydtNodeList.get(0) instanceof YdtMultiInstanceNode) {
+
+            // Storing the number of multiInstance node for number
+            // if instance validation.
+            int instanceCount = ydtNodeList.size();
+
+            YangList list = (YangList) ydtNodeList.get(0).getYangSchemaNode();
+            int minElement;
+            int maxElement;
+            if (list.getMinElements() != null) {
+                minElement = list.getMinElements().getMinElement();
+                if (instanceCount < minElement) {
+                    errorHandler(errorMsg(FMT_FEW_INS, list.getName(),
+                                          minElement), this);
+                }
+            }
+
+            if (list.getMaxElements() != null) {
+                maxElement = list.getMaxElements().getMaxElement();
+                if (instanceCount > maxElement) {
+                    errorHandler(errorMsg(FMT_MANY_INS, list.getName(),
+                                          maxElement), this);
+                }
+            }
+
+            if (list.isConfig() && instanceCount > 1) {
+                // Iterating over values in ydtNodeList of
+                // multiInstanceNode and compare the key string.
+                for (YdtNode ydtNode : ydtNodeList) {
+                    if (!keyStringSet.add(((YdtMultiInstanceNode) ydtNode)
+                                                  .getCompositeKey())) {
+                        errorHandler(errorMsg(
+                                FMT_UNI_KEY, ydtNode.getYdtNodeIdentifier()
+                                        .getName()), this);
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Walks in whole Ydt Tree and de-reference all the tree node.
+     * This will be called only when any exception occurs while processing
+     * the node in Ydt tree.
+     *
+     * @param node ydt node
+     */
+    public void freeRestResources(YdtNode node) {
+        // Traversing to logical rootNode.
+        YdtNode rootNode = node;
+        while (rootNode.getParent() != null) {
+            rootNode = rootNode.getParent();
+        }
+        YdtNode currentNode = rootNode;
+        while (currentNode != null) {
+
+            // Move down to first child
+            YdtNode nextNode = currentNode.getFirstChild();
+            if (nextNode != null) {
+                currentNode = nextNode;
+                continue;
+            }
+
+            // No child nodes, so walk tree
+            while (currentNode != null) {
+                // To keep the track of last sibling.
+                YdtNode lastSibling = currentNode;
+
+                // Move to sibling if possible.
+                nextNode = currentNode.getNextSibling();
+
+                // free currentNode resources
+                free(lastSibling);
+
+                lastSibling.getNamespace();
+                if (nextNode != null) {
+                    currentNode = nextNode;
+                    break;
+                }
+
+                // Move up
+                if (currentNode.equals(rootNode)) {
+                    currentNode = null;
+                } else {
+                    currentNode = currentNode.getParent();
+                    lastSibling.setParent(null);
+                }
+            }
+        }
+    }
+
+    /**
+     * Free the give YDT node by de-referencing it to null.
+     *
+     * @param node node to be freed
+     */
+    private void free(YdtNode node) {
+        if (node.getParent() != null) {
+            YdtNode parent = node.getParent();
+            parent.setChild(null);
+            parent.setLastChild(null);
+            if (node.getNextSibling() != null) {
+                parent.setChild(node.getNextSibling());
+            }
+        }
+        YdtNode parentRef = node.getParent();
+        node = new YdtSingleInstanceNode(null);
+        node.ydtType = null;
+        node.setParent(parentRef);
+    }
+
+    /**
+     * Clones the current node contents and create a new node.
+     *
+     * @return cloned node
+     * @throws CloneNotSupportedException clone is not supported
+     *                                    by the referred node
+     */
+    public YdtNode clone() throws CloneNotSupportedException {
+        YdtNode clonedNode = (YdtNode) super.clone();
+        clonedNode.setPreviousSibling(null);
+        clonedNode.setNextSibling(null);
+        clonedNode.setParent(null);
+        clonedNode.setChild(null);
+        clonedNode.setLastChild(null);
+        return clonedNode;
+    }
+
+    /**
+     * Handles an error scenario, freeing allocated resources for the given YTD
+     * node before throwing an exception with the specified error message.
+     *
+     * @param error   error message
+     * @param curNode ydt node
+     * @throws YdtException with the specified error message
+     */
+    public void errorHandler(String error, YdtNode curNode) {
+        curNode.freeRestResources(curNode);
+        throw new YdtException(error);
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtNodeFactory.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtNodeFactory.java
new file mode 100644
index 0000000..43680da
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtNodeFactory.java
@@ -0,0 +1,256 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+import org.onosproject.yangutils.datamodel.YangSchemaNodeType;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+import org.onosproject.yms.ydt.YdtContextOperationType;
+
+import static org.onosproject.yangutils.datamodel.YangSchemaNodeType.YANG_MULTI_INSTANCE_LEAF_NODE;
+import static org.onosproject.yangutils.datamodel.YangSchemaNodeType.YANG_MULTI_INSTANCE_NODE;
+import static org.onosproject.yangutils.datamodel.YangSchemaNodeType.YANG_SINGLE_INSTANCE_LEAF_NODE;
+import static org.onosproject.yangutils.datamodel.YangSchemaNodeType.YANG_SINGLE_INSTANCE_NODE;
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.DELETE_ONLY;
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.OTHER_EDIT;
+import static org.onosproject.yms.app.ydt.YdtConstants.errorMsg;
+
+/**
+ * Represents an YANG node factory to create different types of YANG data tree
+ * node.
+ */
+final class YdtNodeFactory {
+
+    // ydt formatted error string
+    private static final String FMT_NOT_EXIST =
+            "Schema node with name %s doesn't exist.";
+
+    // No instantiation
+    private YdtNodeFactory() {
+    }
+
+    /**
+     * Returns a YANG data tree node for a given name, set of values and
+     * instance type.
+     *
+     * @param id          dataNodeIdentifier of data tree node
+     * @param schemaNode  data node as per YANG schema metadata
+     * @param cardinality requested cardinality of node
+     * @param callType    identify the call type
+     * @return YANG data tree node
+     */
+    protected static YdtNode getNode(YangSchemaNodeIdentifier id,
+                                     YangSchemaNode schemaNode,
+                                     RequestedCardinality cardinality,
+                                     RequestedCallType callType) {
+
+        YdtNode newNode = null;
+        YangSchemaNodeType nodeType = schemaNode.getYangSchemaNodeType();
+
+        switch (cardinality) {
+
+            case UNKNOWN:
+                /*
+                 * if requested node type is UNKNOWN, check corresponding
+                 * yang data node type and create respective type node.
+                 */
+                newNode = getYangSchemaNodeTypeSpecificContext(id, nodeType,
+                                                               callType);
+                break;
+
+            /*
+             * if requested node type is specified and it exist as node of some
+             * other type in data model then throw exception
+             */
+            case SINGLE_INSTANCE:
+                validateNodeType(id, nodeType, YANG_SINGLE_INSTANCE_NODE);
+                newNode = new YdtSingleInstanceNode(id);
+                break;
+
+            case MULTI_INSTANCE:
+
+                validateNodeType(id, nodeType, YANG_MULTI_INSTANCE_NODE);
+                newNode = new YdtMultiInstanceNode(id);
+                break;
+
+            case SINGLE_INSTANCE_LEAF:
+
+                validateNodeType(id, nodeType, YANG_SINGLE_INSTANCE_LEAF_NODE);
+                newNode = new YdtSingleInstanceLeafNode(id);
+                break;
+
+            case MULTI_INSTANCE_LEAF:
+
+                validateNodeType(id, nodeType, YANG_MULTI_INSTANCE_LEAF_NODE);
+                newNode = new YdtMultiInstanceLeafNode(id);
+                break;
+
+            default:
+                throwNotExistError(id);
+        }
+
+        // set reference of yang data node in the requested node.
+        newNode.setYangSchemaNode(schemaNode);
+
+        return newNode;
+    }
+
+    /**
+     * Validates the requested ydt node type against the schema node type,
+     * if it is not equal then it will throw warning.
+     *
+     * @param id            dataNodeIdentifier of data tree node
+     * @param nodeType      actual node type
+     * @param requestedType user requested node type
+     */
+    private static void validateNodeType(YangSchemaNodeIdentifier id,
+                                         YangSchemaNodeType nodeType,
+                                         YangSchemaNodeType requestedType) {
+        if (nodeType != requestedType) {
+            throwNotExistError(id);
+        }
+    }
+
+    /**
+     * Creates Yang data tree node of YangSchemaNode type specific for
+     * requestedCardinality of type UNKNOWN and returns the same.
+     *
+     * @param id       node identifier of data tree node
+     * @param nodeType schema node type as per YANG schema metadata
+     * @param callType identify the call type
+     * @return YANG data tree node
+     */
+    private static YdtNode getYangSchemaNodeTypeSpecificContext(
+            YangSchemaNodeIdentifier id,
+            YangSchemaNodeType nodeType,
+            RequestedCallType callType) {
+        switch (callType) {
+            case LEAF:
+                switch (nodeType) {
+
+                    case YANG_SINGLE_INSTANCE_LEAF_NODE:
+                        return new YdtSingleInstanceLeafNode(id);
+
+                    case YANG_MULTI_INSTANCE_LEAF_NODE:
+                        return new YdtMultiInstanceLeafNode(id);
+
+                    default:
+                        throwNotExistError(id);
+                }
+
+            case OTHER:
+                switch (nodeType) {
+
+                    case YANG_SINGLE_INSTANCE_NODE:
+                        return new YdtSingleInstanceNode(id);
+
+                    case YANG_MULTI_INSTANCE_NODE:
+                        return new YdtMultiInstanceNode(id);
+
+                    default:
+                        throwNotExistError(id);
+                }
+
+            case MULTI_INSTANCE:
+                switch (nodeType) {
+
+                    case YANG_MULTI_INSTANCE_LEAF_NODE:
+                        return new YdtMultiInstanceLeafNode(id);
+
+                    case YANG_MULTI_INSTANCE_NODE:
+                        return new YdtMultiInstanceNode(id);
+
+                    default:
+                        throwNotExistError(id);
+                }
+
+            default:
+                throwNotExistError(id);
+        }
+
+        return null;
+    }
+
+    /**
+     * Create Yang data tree node of YangSchemaNode type specific and
+     * returns the same.
+     *
+     * @param id       node identifier of data tree node
+     * @param nodeType schema node type as per YANG schema metadata
+     * @return YANG data tree node
+     */
+    protected static YdtNode getYangSchemaNodeTypeSpecificContext(
+            YangSchemaNodeIdentifier id,
+            YangSchemaNodeType nodeType) {
+
+        switch (nodeType) {
+
+            case YANG_SINGLE_INSTANCE_LEAF_NODE:
+                return new YdtSingleInstanceLeafNode(id);
+
+            case YANG_MULTI_INSTANCE_LEAF_NODE:
+                return new YdtMultiInstanceLeafNode(id);
+
+            case YANG_SINGLE_INSTANCE_NODE:
+                return new YdtSingleInstanceNode(id);
+
+            case YANG_MULTI_INSTANCE_NODE:
+                return new YdtMultiInstanceNode(id);
+
+            default:
+                throwNotExistError(id);
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns the app tree operation type with the help of YdtOperation type.
+     *
+     * @param opType ydt operation type
+     * @return app tree operation type
+     */
+    protected static YdtAppNodeOperationType getAppOpTypeFromYdtOpType(
+            YdtContextOperationType opType) {
+        // Get the app tree operation type.
+        switch (opType) {
+            case CREATE:
+            case MERGE:
+            case REPLACE:
+                return OTHER_EDIT;
+
+            case DELETE:
+            case REMOVE:
+                return DELETE_ONLY;
+
+            default:
+                return null;
+            //TODO handle the default data type.
+        }
+    }
+
+    /**
+     * Throws exception for requested ydt node by preparing error message with
+     * given node identifier.
+     *
+     * @param id node identifier
+     */
+    private static void throwNotExistError(YangSchemaNodeIdentifier id) {
+        throw new YdtException(errorMsg(FMT_NOT_EXIST, id.getName()));
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtSingleInstanceLeafNode.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtSingleInstanceLeafNode.java
new file mode 100644
index 0000000..0bd7036
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtSingleInstanceLeafNode.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+
+import static org.onosproject.yms.app.ydt.YdtConstants.FMT_DUP_ENTRY;
+import static org.onosproject.yms.app.ydt.YdtConstants.errorMsg;
+import static org.onosproject.yms.ydt.YdtType.SINGLE_INSTANCE_LEAF_VALUE_NODE;
+
+/**
+ * Represents YDT single instance leaf node which is an atomic element
+ * and doesn't have any child.
+ */
+class YdtSingleInstanceLeafNode extends YdtNode {
+
+    /*
+     * Value of the leaf.
+     */
+    private String value;
+
+    /**
+     * Creates a YANG single instance leaf node.
+     *
+     * @param id node identifier of YDT single instance leaf node
+     */
+    protected YdtSingleInstanceLeafNode(YangSchemaNodeIdentifier id) {
+        super(SINGLE_INSTANCE_LEAF_VALUE_NODE, id);
+    }
+
+    @Override
+    public String getValue() {
+        return value;
+    }
+
+    @Override
+    public void addValue(String value) {
+        // Check the value against corresponding data-type.
+        try {
+            getYangSchemaNode().isValueValid(value);
+        } catch (Exception e) {
+            errorHandler(e.getLocalizedMessage(), this);
+        }
+
+        // After validation is successful then add value to node.
+        this.value = value;
+    }
+
+
+    @Override
+    public void addValueWithoutValidation(String value) {
+        this.value = value;
+    }
+
+    @Override
+    public void validDuplicateEntryProcessing() {
+        errorHandler(errorMsg(FMT_DUP_ENTRY, getYdtNodeIdentifier().getName()),
+                     this);
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtSingleInstanceNode.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtSingleInstanceNode.java
new file mode 100644
index 0000000..b7f84b5
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/YdtSingleInstanceNode.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangSchemaNodeIdentifier;
+
+import static org.onosproject.yms.app.ydt.YdtConstants.FMT_DUP_ENTRY;
+import static org.onosproject.yms.app.ydt.YdtConstants.errorMsg;
+import static org.onosproject.yms.ydt.YdtType.SINGLE_INSTANCE_NODE;
+
+/**
+ * Represents a single instance YANG data tree node.
+ */
+class YdtSingleInstanceNode extends YdtNode {
+
+    /**
+     * Creates a YANG single instance node object.
+     *
+     * @param id node identifier of YDT single instance node
+     */
+    protected YdtSingleInstanceNode(YangSchemaNodeIdentifier id) {
+        super(SINGLE_INSTANCE_NODE, id);
+    }
+
+    @Override
+    public void validDuplicateEntryProcessing() {
+        errorHandler(errorMsg(FMT_DUP_ENTRY, getYdtNodeIdentifier().getName()),
+                     this);
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/exceptions/YdtException.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/exceptions/YdtException.java
new file mode 100644
index 0000000..db21976
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/exceptions/YdtException.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt.exceptions;
+
+/**
+ * Represents base class for exceptions in YDT operations.
+ */
+public class YdtException extends RuntimeException {
+
+    private static final long serialVersionUID = 20160211L;
+
+    /**
+     * Creates a new YDT exception with given message.
+     *
+     * @param message the detail of exception in string
+     */
+    public YdtException(String message) {
+        super(message);
+    }
+
+    /**
+     * Creates a new YDT exception from given message and cause.
+     *
+     * @param message the detail of exception in string
+     * @param cause   underlying cause of the error
+     */
+    public YdtException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    /**
+     * Creates a new YDT exception from cause.
+     *
+     * @param cause underlying cause of the error
+     */
+    public YdtException(Throwable cause) {
+        super(cause);
+    }
+
+    /**
+     * Creates a new YDT exception from given parameters.
+     *
+     * @param keyword identify error scenario whether it is many or few
+     * @param name    name of the node
+     * @param count   supported count value
+     */
+    public YdtException(String keyword, String name, int count) {
+        super("Too " + keyword + " key parameter in " + name + ". Expected " +
+                      "count " + count + ".");
+    }
+}
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/exceptions/package-info.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/exceptions/package-info.java
new file mode 100644
index 0000000..20da849
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/exceptions/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * YANG data tree exceptions.
+ */
+package org.onosproject.yms.app.ydt.exceptions;
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/package-info.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/package-info.java
new file mode 100644
index 0000000..2ed1950
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ydt/package-info.java
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Provides implementation of build and obtain YANG data tree which is data
+ * (sub)instance representation, abstract of protocol.
+ */
+package org.onosproject.yms.app.ydt;
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ymsm/YmsManager.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ymsm/YmsManager.java
index f4030ce..b9ea3a8 100644
--- a/apps/yms/app/src/main/java/org/onosproject/yms/app/ymsm/YmsManager.java
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ymsm/YmsManager.java
@@ -25,6 +25,8 @@
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
 import org.onosproject.core.IdGenerator;
+import org.onosproject.yms.app.ydt.DefaultYdtWalker;
+import org.onosproject.yms.app.ydt.YangRequestWorkBench;
 import org.onosproject.yms.app.ynh.YangNotificationExtendedService;
 import org.onosproject.yms.app.ysr.DefaultYangSchemaRegistry;
 import org.onosproject.yms.app.ysr.YangSchemaRegistry;
@@ -97,7 +99,8 @@
     public YdtBuilder getYdtBuilder(String logicalRootName,
                                     String rootNamespace,
                                     YmsOperationType operationType) {
-        return null;
+        return new YangRequestWorkBench(logicalRootName, rootNamespace,
+                                        operationType, schemaRegistry, true);
     }
 
     @Override
@@ -105,12 +108,20 @@
                                     String rootNamespace,
                                     YmsOperationType operationType,
                                     Object schemaRegistryForYdt) {
-        return null;
+        if (schemaRegistryForYdt != null) {
+            return new YangRequestWorkBench(logicalRootName, rootNamespace,
+                                            operationType,
+                                            (YangSchemaRegistry)
+                                                    schemaRegistryForYdt,
+                                            false);
+        }
+        return new YangRequestWorkBench(logicalRootName, rootNamespace,
+                                        operationType, schemaRegistry, true);
     }
 
     @Override
     public YdtWalker getYdtWalker() {
-        return null;
+        return new DefaultYdtWalker();
     }
 
     @Override
@@ -177,5 +188,4 @@
     public YangSchemaRegistry getSchemaRegistry() {
         return schemaRegistry;
     }
-
 }
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/AugmentTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/AugmentTest.java
new file mode 100644
index 0000000..8fd5580
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/AugmentTest.java
@@ -0,0 +1,528 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.junit.Assert.assertNull;
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.BOTH;
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.DELETE_ONLY;
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.OTHER_EDIT;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A1;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A2;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A2L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A3;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A4;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A5;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A5L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A6;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A6L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG1;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG2;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG3;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG4;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG5;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG6;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG7;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG9;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.IETF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SLINK;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.STP;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TOPONS;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.augmentNetworkYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateAppLogicalNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateAppModuleNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateAppNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafListContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.walkINTree;
+import static org.onosproject.yms.ydt.YdtContextOperationType.DELETE;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class AugmentTest {
+
+    private Set<String> valueSet = new HashSet();
+
+    private static final String[] EXPECTED = {
+            "Entry Node is yms-ietf-network.",
+            "Entry Node is yms-ietf-network.",
+            "Entry Node is networks.",
+            "Entry Node is network.",
+            "Entry Node is network-id.",
+            "Exit Node is network-id.",
+            "Entry Node is link.",
+            "Entry Node is link-id.",
+            "Exit Node is link-id.",
+            "Entry Node is source.",
+            "Entry Node is source-node.",
+            "Exit Node is source-node.",
+            "Entry Node is source-tp.",
+            "Exit Node is source-tp.",
+            "Exit Node is source.",
+
+            "Entry Node is destination.",
+            "Entry Node is dest-node.",
+            "Exit Node is dest-node.",
+            "Entry Node is dest-tp.",
+            "Exit Node is dest-tp.",
+            "Exit Node is destination.",
+
+            "Entry Node is supporting-link.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is link-ref.",
+            "Exit Node is link-ref.",
+            "Exit Node is supporting-link.",
+
+            "Entry Node is supporting-link.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is link-ref.",
+            "Exit Node is link-ref.",
+            "Exit Node is supporting-link.",
+
+            "Entry Node is augment1.",
+            "Entry Node is value1.",
+            "Exit Node is value1.",
+            "Exit Node is augment1.",
+
+            "Entry Node is augment2.",
+            "Entry Node is key1.",
+            "Exit Node is key1.",
+            "Entry Node is key2.",
+            "Exit Node is key2.",
+
+            "Entry Node is augment5.",
+
+            "Entry Node is augment6leafList.",
+            "Exit Node is augment6leafList.",
+
+            "Entry Node is value5.",
+            "Exit Node is value5.",
+            "Exit Node is augment5.",
+
+            "Entry Node is augment5leafList.",
+            "Exit Node is augment5leafList.",
+
+            "Entry Node is augment3.",
+
+            "Entry Node is augment4.",
+            "Entry Node is value4.",
+            "Exit Node is value4.",
+            "Exit Node is augment4.",
+
+            "Entry Node is augment5.",
+
+            "Entry Node is leaf6.",
+            "Exit Node is leaf6.",
+
+            "Entry Node is value5.",
+            "Exit Node is value5.",
+            "Exit Node is augment5.",
+
+            "Entry Node is augment6.",
+            "Entry Node is value6.",
+            "Exit Node is value6.",
+            "Exit Node is augment6.",
+
+            "Entry Node is value3.",
+            "Exit Node is value3.",
+            "Exit Node is augment3.",
+
+            "Entry Node is augment3leaf.",
+            "Exit Node is augment3leaf.",
+
+            "Exit Node is augment2.",
+
+            "Entry Node is augment2leafList.",
+            "Exit Node is augment2leafList.",
+
+            "Exit Node is link.",
+
+            "Entry Node is supporting-network.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Exit Node is supporting-network.",
+            "Entry Node is node.",
+            "Entry Node is node-id.",
+            "Exit Node is node-id.",
+            "Entry Node is t-point.",
+            "Entry Node is tp-id.",
+            "Exit Node is tp-id.",
+
+            "Entry Node is supporting-termination-point.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is node-ref.",
+            "Exit Node is node-ref.",
+            "Entry Node is tp-ref.",
+            "Exit Node is tp-ref.",
+
+            "Entry Node is augment1.",
+            "Entry Node is value1.",
+            "Exit Node is value1.",
+            "Exit Node is augment1.",
+
+            "Entry Node is augment1-leaf.",
+            "Exit Node is augment1-leaf.",
+
+            "Entry Node is augment2.",
+
+            "Entry Node is augment3.",
+            "Entry Node is value3.",
+            "Exit Node is value3.",
+            "Exit Node is augment3.",
+
+            "Entry Node is augment4leaf.",
+            "Exit Node is augment4leaf.",
+
+            "Entry Node is value2.",
+            "Exit Node is value2.",
+            "Exit Node is augment2.",
+            "Entry Node is augment2leafList.",
+            "Exit Node is augment2leafList.",
+            "Entry Node is augment2leaf.",
+            "Exit Node is augment2leaf.",
+
+            "Exit Node is supporting-termination-point.",
+            "Exit Node is t-point.",
+            "Entry Node is supporting-node.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is node-ref.",
+            "Exit Node is node-ref.",
+            "Exit Node is supporting-node.",
+
+            "Exit Node is node.",
+            // last augmented sibling in network
+            "Entry Node is link-id.",
+            "Exit Node is link-id.",
+
+            "Exit Node is network.",
+            "Exit Node is networks.",
+            "Entry Node is networks-state.",
+            "Entry Node is network.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is server-provided.",
+            "Exit Node is server-provided.",
+            "Exit Node is network.",
+            "Exit Node is networks-state.",
+            "Exit Node is yms-ietf-network.",
+            "Exit Node is yms-ietf-network."
+    };
+
+    /**
+     * Creates and validates ietf network augment ydt.
+     */
+    @Test
+    public void augmentTest() {
+        YangRequestWorkBench ydtBuilder = augmentNetworkYdt();
+        validateTree(ydtBuilder);
+        validateAppTree(ydtBuilder);
+        walkINTree(ydtBuilder, EXPECTED);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // Assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "yms-ietf-network", null);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "yms-ietf-network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "networks", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-id", "network1");
+        ydtNode = ydtNode.getNextSibling();
+
+        // Validating augmented child
+        validateNodeContents(ydtNode, "link", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "link-id", "id1");
+        ydtNode = ydtNode.getNextSibling();
+
+        // Inside source node
+        validateNodeContents(ydtNode, "source", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "source-node", "source1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "source-tp", "source2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside destination node
+        validateNodeContents(ydtNode, "destination", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "dest-node", "dest1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "dest-tp", "dest2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside supporting links
+        validateNodeContents(ydtNode, SLINK, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "link-ref", "id2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside another supporting links instance
+        validateNodeContents(ydtNode, SLINK, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network2");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "link-ref", "id3");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        validateNodeContents(ydtNode, "augment1", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value1", "1");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment2", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "key1", "1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "key2", "2");
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment5", DELETE);
+        ydtNode = ydtNode.getFirstChild();
+        valueSet.add("1");
+        valueSet.add("2");
+        validateLeafListContents(ydtNode, A6L, valueSet);
+        ydtNode = ydtNode.getNextSibling();
+
+        validateLeafContents(ydtNode, "value5", "5");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafListContents(ydtNode, A5L, valueSet);
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment3", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+
+        validateNodeContents(ydtNode, "augment4", DELETE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value4", "4");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        validateNodeContents(ydtNode, "augment5", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+
+        validateLeafContents(ydtNode, "leaf6", "6");
+        ydtNode = ydtNode.getNextSibling();
+
+        validateLeafContents(ydtNode, "value5", "5");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        validateNodeContents(ydtNode, "augment6", DELETE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value6", "6");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        validateLeafContents(ydtNode, "value3", "3");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "augment3leaf", "3");
+
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafListContents(ydtNode, A2L, valueSet);
+
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "supporting-network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network2");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "node", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "node-id", "node1");
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside termination-point
+        validateNodeContents(ydtNode, "t-point", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "tp-id", "tp_id1");
+        ydtNode = ydtNode.getNextSibling();
+
+        validateTerminationPointAugment(ydtNode);
+    }
+
+    /**
+     * Validates the termination point node in given built ydt.
+     */
+    private void validateTerminationPointAugment(YdtNode ydtNode) {
+
+        //Inside supporting-termination-point
+        validateNodeContents(ydtNode, STP, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network-ref");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "node-ref", "node-ref");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "tp-ref", "tp-ref");
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment1", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value1", "1");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "augment1-leaf", "1");
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "augment2", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+
+        validateNodeContents(ydtNode, "augment3", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "value3", "3");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "augment4leaf", "4");
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "value2", "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafListContents(ydtNode, A2L, valueSet);
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "augment2leaf", "2");
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "supporting-node", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network3");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "node-ref", "network4");
+
+        ydtNode = ydtNode.getParent().getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "link-id", "id1");
+        ydtNode = ydtNode.getParent().getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "networks-state", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network5");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "server-provided", "true");
+    }
+
+    /**
+     * Validates the given built ydt application tree.
+     */
+    private void validateAppTree(YangRequestWorkBench ydtBuilder) {
+
+        // Assign root node to ydtNode for validating purpose.
+        YdtAppContext ydtAppContext = ydtBuilder.getAppRootNode();
+        // Logical root node does not have operation type
+        validateAppLogicalNodeContents(ydtAppContext);
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppModuleNodeContents(ydtAppContext, IETF, BOTH);
+        ydtAppContext = ydtAppContext.getFirstChild();
+
+        //Inside link node
+        validateAppNodeContents(ydtAppContext, AUG1, TOPONS, BOTH);
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG3, A1, OTHER_EDIT);
+        assertNull(ydtAppContext.getFirstChild());
+        assertNull(ydtAppContext.getPreviousSibling());
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG3, A2, BOTH);
+
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG5, A5, DELETE_ONLY);
+
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG9, A6, DELETE_ONLY);
+        ydtAppContext = ydtAppContext.getParent();
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG5, A3, BOTH);
+
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG7, A4, DELETE_ONLY);
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG7, A5, OTHER_EDIT);
+
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG8, A6, OTHER_EDIT);
+        ydtAppContext = ydtAppContext.getParent();
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG7, A6, DELETE_ONLY);
+
+        ydtAppContext = ydtAppContext.getParent();
+        ydtAppContext = ydtAppContext.getParent();
+        ydtAppContext = ydtAppContext.getParent();
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+
+        validateAppNodeContents(ydtAppContext, AUG2, TOPONS, OTHER_EDIT);
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG4, A1, OTHER_EDIT);
+        assertNull(ydtAppContext.getFirstChild());
+        assertNull(ydtAppContext.getPreviousSibling());
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG4, A2, OTHER_EDIT);
+        assertNull(ydtAppContext.getNextSibling());
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppNodeContents(ydtAppContext, AUG6, A3, OTHER_EDIT);
+
+        ydtAppContext = ydtAppContext.getNextSibling();
+        validateAppNodeContents(ydtAppContext, AUG6, A4, OTHER_EDIT);
+        assertNull(ydtAppContext.getFirstChild());
+        assertNull(ydtAppContext.getNextSibling());
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/FoodArenaTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/FoodArenaTest.java
new file mode 100644
index 0000000..7f058a9
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/FoodArenaTest.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.onosproject.yms.app.ydt.YdtTestUtils.foodArenaYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.walkINTree;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class FoodArenaTest {
+
+    // Logger list is used for walker testing.
+    private final List<String> logger = new ArrayList<>();
+
+    private static final String[] EXPECTED = {
+            "Entry Node is foodarena.",
+            "Entry Node is food.",
+            "Entry Node is food.",
+            "Entry Node is chocolate.",
+            "Exit Node is chocolate.",
+            "Exit Node is food.",
+            "Exit Node is food.",
+            "Exit Node is foodarena."
+    };
+
+    /**
+     * Creates and validates food arena ydt.
+     */
+    @Test
+    public void foodArenaTest() throws IOException {
+
+        YangRequestWorkBench ydtBuilder = foodArenaYdt();
+        validateTree(ydtBuilder);
+        walkINTree(ydtBuilder, EXPECTED);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+        // Assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "foodarena", null);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "food", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "food", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "chocolate", "dark");
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/IetfNetworkTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/IetfNetworkTest.java
new file mode 100644
index 0000000..0befc4d
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/IetfNetworkTest.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+
+import static org.onosproject.yms.app.ydt.YdtTestUtils.ietfNetwork1Ydt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.walkINTree;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class IetfNetworkTest {
+
+    private static final String[] EXPECTED = {
+            "Entry Node is yms-ietf-network.",
+            "Entry Node is yms-ietf-network.",
+            "Entry Node is networks.",
+            "Entry Node is network.",
+            "Entry Node is network-id.",
+            "Exit Node is network-id.",
+            "Entry Node is supporting-network.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Exit Node is supporting-network.",
+            "Entry Node is node.",
+            "Entry Node is node-id.",
+            "Exit Node is node-id.",
+            "Entry Node is supporting-node.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is node-ref.",
+            "Exit Node is node-ref.",
+            "Exit Node is supporting-node.",
+            "Exit Node is node.",
+            "Exit Node is network.",
+            "Exit Node is networks.",
+            "Entry Node is networks-state.",
+            "Entry Node is network.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is server-provided.",
+            "Exit Node is server-provided.",
+            "Exit Node is network.",
+            "Exit Node is networks-state.",
+            "Exit Node is yms-ietf-network.",
+            "Exit Node is yms-ietf-network."
+    };
+
+    /**
+     * Creates and validates ietf network ydt.
+     */
+    @Test
+    public void ietfNetwork1Test() {
+        YangRequestWorkBench ydtBuilder = ietfNetwork1Ydt();
+        validateTree(ydtBuilder);
+        walkINTree(ydtBuilder, EXPECTED);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // Assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "yms-ietf-network", null);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "yms-ietf-network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "networks", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-id", "network1");
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "supporting-network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network2");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "node", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "node-id", "node1");
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "supporting-node", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network3");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "node-ref", "network4");
+
+        ydtNode = ydtNode.getParent().getParent().getParent().getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "networks-state", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network5");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "server-provided", "true");
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/IetfTopologyTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/IetfTopologyTest.java
new file mode 100644
index 0000000..c757b0c
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/IetfTopologyTest.java
@@ -0,0 +1,268 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+
+import static org.onosproject.yms.app.ydt.YdtAppNodeOperationType.OTHER_EDIT;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG1;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.AUG2;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.IETF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SLINK;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.STP;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TOPONS;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.ietfNetworkTopologyYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateAppLogicalNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateAppModuleNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateAppNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.walkINTree;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class IetfTopologyTest {
+
+    private static final String[] EXPECTED = {
+            "Entry Node is yms-ietf-network.",
+            "Entry Node is yms-ietf-network.",
+            "Entry Node is networks.",
+            "Entry Node is network.",
+            "Entry Node is network-id.",
+            "Exit Node is network-id.",
+            "Entry Node is link.",
+            "Entry Node is link-id.",
+            "Exit Node is link-id.",
+            "Entry Node is source.",
+            "Entry Node is source-node.",
+            "Exit Node is source-node.",
+            "Entry Node is source-tp.",
+            "Exit Node is source-tp.",
+            "Exit Node is source.",
+
+            "Entry Node is destination.",
+            "Entry Node is dest-node.",
+            "Exit Node is dest-node.",
+            "Entry Node is dest-tp.",
+            "Exit Node is dest-tp.",
+            "Exit Node is destination.",
+
+            "Entry Node is supporting-link.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is link-ref.",
+            "Exit Node is link-ref.",
+            "Exit Node is supporting-link.",
+
+            "Entry Node is supporting-link.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is link-ref.",
+            "Exit Node is link-ref.",
+            "Exit Node is supporting-link.",
+            "Exit Node is link.",
+
+            "Entry Node is supporting-network.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Exit Node is supporting-network.",
+            "Entry Node is node.",
+            "Entry Node is node-id.",
+            "Exit Node is node-id.",
+            "Entry Node is t-point.",
+            "Entry Node is tp-id.",
+            "Exit Node is tp-id.",
+
+            "Entry Node is supporting-termination-point.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is node-ref.",
+            "Exit Node is node-ref.",
+            "Entry Node is tp-ref.",
+            "Exit Node is tp-ref.",
+
+            "Exit Node is supporting-termination-point.",
+            "Exit Node is t-point.",
+            "Entry Node is supporting-node.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is node-ref.",
+            "Exit Node is node-ref.",
+            "Exit Node is supporting-node.",
+
+            "Exit Node is node.",
+            // last augmented sibling in network
+            "Entry Node is link-id.",
+            "Exit Node is link-id.",
+
+            "Exit Node is network.",
+            "Exit Node is networks.",
+            "Entry Node is networks-state.",
+            "Entry Node is network.",
+            "Entry Node is network-ref.",
+            "Exit Node is network-ref.",
+            "Entry Node is server-provided.",
+            "Exit Node is server-provided.",
+            "Exit Node is network.",
+            "Exit Node is networks-state.",
+            "Exit Node is yms-ietf-network.",
+            "Exit Node is yms-ietf-network."
+    };
+
+    /**
+     * Creates and validates ietf network ydt.
+     */
+    @Test
+    public void ietfNetwork1Test() {
+        YangRequestWorkBench ydtBuilder = ietfNetworkTopologyYdt();
+        validateTree(ydtBuilder);
+        validateAppTree(ydtBuilder);
+        walkINTree(ydtBuilder, EXPECTED);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // Assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "yms-ietf-network", null);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "yms-ietf-network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "networks", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-id", "network1");
+        ydtNode = ydtNode.getNextSibling();
+
+        // Validating augmented child
+        validateNodeContents(ydtNode, "link", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "link-id", "id1");
+        ydtNode = ydtNode.getNextSibling();
+
+        // Inside source node
+        validateNodeContents(ydtNode, "source", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "source-node", "source1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "source-tp", "source2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside destination node
+        validateNodeContents(ydtNode, "destination", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "dest-node", "dest1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "dest-tp", "dest2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside supporting links
+        validateNodeContents(ydtNode, SLINK, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network1");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "link-ref", "id2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside another supporting links instance
+        validateNodeContents(ydtNode, SLINK, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network2");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "link-ref", "id3");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "supporting-network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network2");
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "node", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "node-id", "node1");
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside termination-point
+        validateNodeContents(ydtNode, "t-point", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "tp-id", "tp_id1");
+        ydtNode = ydtNode.getNextSibling();
+
+        //Inside supporting-termination-point
+        validateNodeContents(ydtNode, STP, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network-ref");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "node-ref", "node-ref");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "tp-ref", "tp-ref");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "supporting-node", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network3");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "node-ref", "network4");
+
+        ydtNode = ydtNode.getParent().getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "link-id", "id1");
+        ydtNode = ydtNode.getParent().getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "networks-state", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "network", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "network-ref", "network5");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "server-provided", "true");
+    }
+
+    /**
+     * Validates the given built ydt application tree.
+     */
+    private void validateAppTree(YangRequestWorkBench ydtBuilder) {
+
+        // Assign root node to ydtNode for validating purpose.
+        YdtAppContext ydtAppContext = ydtBuilder.getAppRootNode();
+        // Logical root node does not have operation type
+        validateAppLogicalNodeContents(ydtAppContext);
+        ydtAppContext = ydtAppContext.getFirstChild();
+        validateAppModuleNodeContents(ydtAppContext, IETF, OTHER_EDIT);
+        ydtAppContext = ydtAppContext.getFirstChild();
+
+        //Inside link node
+        validateAppNodeContents(ydtAppContext, AUG1, TOPONS, OTHER_EDIT);
+        ydtAppContext = ydtAppContext.getNextSibling();
+
+        validateAppNodeContents(ydtAppContext, AUG2, TOPONS, OTHER_EDIT);
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/ListTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/ListTest.java
new file mode 100644
index 0000000..711f882
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/ListTest.java
@@ -0,0 +1,450 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.utils.builtindatatype.DataTypeException;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.E_LEAF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.E_LIST;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.E_TOPARENT;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INV;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.LISTNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.LWC;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.getTestYdtBuilder;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.getYdtBuilder;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.listWithContainer1Ydt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.listWithContainer2Ydt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.listWithContainerYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.listWithoutContainerYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafListContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.walkINTree;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class ListTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private Set<String> valueSet = new HashSet();
+
+    private static final String[] ERROR = {
+            "rootlist is missing some of the keys of listwithcontainer.",
+            "Duplicate entry with name invalid.",
+            "Some of the key elements are not unique in listwithcontainer.",
+            "Too few key parameters in listwithcontainer." +
+                    " Expected 2; actual 1.",
+            "Too many key parameters in listwithcontainer." +
+                    " Expected 2; actual 3.",
+            "Application with name \"" + "invalid\" doesn't exist.",
+            "Too many instances of listwithcontainer. Expected maximum " +
+                    "instances 3.",
+            "Duplicate entry found under invalidinterval leaf-list node.",
+            "YANG file error : Input value \"string\" is not a valid uint16."
+    };
+
+    private static final String[] EXPECTED = {
+            "Entry Node is list.",
+            "Entry Node is rootlist.",
+            "Entry Node is listwithoutcontainer.",
+            "Entry Node is invalidinterval.",
+            "Exit Node is invalidinterval.",
+            "Exit Node is listwithoutcontainer.",
+            "Exit Node is rootlist.",
+            "Exit Node is list."
+    };
+
+    List<String> keysValueList = new ArrayList<>();
+
+    /**
+     * Creates and validates rootlist module with listwithoutcontainer node.
+     */
+    @Test
+    public void listwithoutcontainerTest() throws YdtException {
+        YangRequestWorkBench ydtBuilder = listWithoutContainerYdt();
+        validateTree(ydtBuilder);
+        // walker test
+        walkINTree(ydtBuilder, EXPECTED);
+    }
+
+    /**
+     * Creates and validates rootlist module with listwithcontainer node
+     * using addMultiInstanceChild interface for adding multi instance node.
+     */
+    @Test
+    public void listwithcontainerTest() throws YdtException {
+        YangRequestWorkBench ydtBuilder = listWithContainerYdt();
+        validateListwithcontainerTree(ydtBuilder);
+    }
+
+    /**
+     * Creates and validates rootlist module with listwithcontainer
+     * node using addChild interface for adding multi instance node.
+     */
+    @Test
+    public void listwithcontainer1Test() throws YdtException {
+        YangRequestWorkBench ydtBuilder = listWithContainer1Ydt();
+        validateListwithcontainerTree(ydtBuilder);
+    }
+
+    /**
+     * Creates and validates rootlist module with multiple instances of
+     * listwithcontainer node using addMultiInstanceChild interface for adding
+     * multi instance node.
+     */
+    @Test
+    public void listwithcontainer2Test() throws YdtException {
+        YangRequestWorkBench ydtBuilder = listWithContainer2Ydt();
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "list", null);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "rootlist", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "listwithoutcontainer", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, INV, "12");
+    }
+
+    /**
+     * Validates the given list with container built ydt.
+     */
+    private void validateListwithcontainerTree(
+            YangRequestWorkBench ydtBuilder) {
+
+        valueSet.add("1");
+        valueSet.add("2");
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "list", null);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "rootlist", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, LWC, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "invalid", "12");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "invalid1", "12");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafListContents(ydtNode, INV, valueSet);
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "interface", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, INV, "12");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "invalid", "121");
+    }
+
+    /**
+     * Tests the negative error scenario when application name for ydt is
+     * invalid.
+     */
+    @Test
+    public void negative1Test() {
+        thrown.expect(YdtException.class);
+        thrown.expectMessage(ERROR[5]);
+        getYdtBuilder("list", "invalid", "ydt.invalid", MERGE);
+    }
+
+    /**
+     * Tests the negative error scenario when list node is not having all
+     * key elements.
+     */
+    @Test
+    public void negative2Test() throws YdtException {
+
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+
+        traversToParentErrorMsgValidator(ydtBuilder, ERROR[0]);
+    }
+
+    /**
+     * Tests the negative error scenario when duplicate entry of list node
+     * is created.
+     */
+    @Test
+    public void negative3Test() throws YdtException {
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        leafErrorMsgValidator(ydtBuilder, "invalid", "12", ERROR[1]);
+    }
+
+    /**
+     * Tests the negative error scenario when key elements of list node
+     * are not unique.
+     */
+    @Test
+    public void negative4Test() throws YdtException {
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        traversToParentErrorMsgValidator(ydtBuilder, ERROR[2]);
+    }
+
+    /**
+     * Tests the negative error scenario when all key elements of list node
+     * are not supplied.
+     */
+    @Test
+    public void negative5Test() throws YdtException {
+        keysValueList.clear();
+        keysValueList.add("1");
+        keysValueList.add("2");
+        keysValueList.add("2");
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        listNodeErrorMsgValidator(ydtBuilder, keysValueList, ERROR[4]);
+
+        keysValueList.clear();
+        keysValueList.add("1");
+        ydtBuilder = getTestYdtBuilder(LISTNS);
+        listNodeErrorMsgValidator(ydtBuilder, keysValueList, ERROR[3]);
+    }
+
+    /**
+     * Tests the negative error scenario when instances of a list node are
+     * created above the allowed limit.
+     */
+    @Test
+    public void negative6Test() throws YdtException {
+        keysValueList.clear();
+        keysValueList.add("1");
+        keysValueList.add("1");
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        ydtBuilder.addMultiInstanceChild(LWC, LISTNS, keysValueList, null);
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", LISTNS, "121");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", LISTNS, "1211");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", LISTNS, "21");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        traversToParentErrorMsgValidator(ydtBuilder, ERROR[6]);
+    }
+
+    /**
+     * Tests the negative error scenario when list node is not having all
+     * key elements.
+     */
+    @Test
+    public void negative7Test() throws YdtException {
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        ydtBuilder.addChild(LWC, LISTNS);
+        traversToParentErrorMsgValidator(ydtBuilder, ERROR[0]);
+    }
+
+    /**
+     * Tests the negative error scenario when duplicate key entry is created
+     * inside leaf-list node.
+     */
+    @Test
+    public void negative8Test() throws YdtException {
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(INV, LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        leafErrorMsgValidator(ydtBuilder, INV, "12", ERROR[7]);
+    }
+
+    /**
+     * Tests the negative error scenario when string is passed for uint16 type
+     * leaf node.
+     */
+    @Test
+    public void negative9Test() throws YdtException {
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        leafErrorMsgValidator(ydtBuilder, INV, "string", ERROR[8]);
+    }
+
+    /**
+     * Tests the negative error scenario when duplicate key entry created
+     * inside a leaf-list node.
+     */
+    @Test
+    public void negative10Test() throws YdtException {
+        valueSet.clear();
+        valueSet.add("1");
+        valueSet.add("2");
+        valueSet.add("12");
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(INV, LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        thrown.expect(YdtException.class);
+        thrown.expectMessage(ERROR[7]);
+        ydtBuilder.addLeaf(INV, LISTNS, valueSet);
+    }
+
+    /**
+     * Tests the negative error scenario when string is passed for uint16 type
+     * key entry inside a leaf-list node.
+     */
+    @Test
+    public void negative11Test() throws YdtException {
+        valueSet.clear();
+        valueSet.add("string");
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(LISTNS);
+        ydtBuilder.addChild(LWC, LISTNS);
+        ydtBuilder.addLeaf("invalid", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(INV, LISTNS, "12");
+        ydtBuilder.traverseToParent();
+        thrown.expect(DataTypeException.class);
+        thrown.expectMessage(ERROR[8]);
+        ydtBuilder.addLeaf(INV, LISTNS, valueSet);
+    }
+
+    /**
+     * Validate the error message obtained by adding multi instance node in
+     * current context against the given error string.
+     *
+     * @param bldr  ydt builder
+     * @param list  list of key values
+     * @param error error string
+     */
+    private void listNodeErrorMsgValidator(YangRequestWorkBench bldr,
+                                           List<String> list, String error) {
+        /*
+         * This try catch is explicitly written to use as utility in other
+         * test cases.
+         */
+        boolean isExpOccurred = false;
+        try {
+            bldr.addMultiInstanceChild(LWC, LISTNS, list, null);
+        } catch (YdtException e) {
+            isExpOccurred = true;
+            assertEquals(e.getMessage(), error);
+        }
+        assertEquals(E_LIST + LWC, isExpOccurred, true);
+    }
+
+    /**
+     * Validate the error message obtained by traversing back to parent of
+     * current context against the given error string.
+     *
+     * @param ydtBuilder ydt builder
+     * @param error      error string
+     */
+    private void traversToParentErrorMsgValidator(
+            YangRequestWorkBench ydtBuilder, String error) {
+        /*
+         * This try catch is explicitly written to use as utility in other
+         * test cases.
+         */
+        boolean isExpOccurred = false;
+        try {
+            ydtBuilder.traverseToParent();
+        } catch (YdtException e) {
+            isExpOccurred = true;
+            assertEquals(e.getMessage(), error);
+        }
+        assertEquals(E_TOPARENT, isExpOccurred, true);
+    }
+
+    /**
+     * Validate the error message obtained by adding leaf node in
+     * current context against the given error string.
+     *
+     * @param bldr  ydt builder
+     * @param name  name of the leaf
+     * @param val   leaf value
+     * @param error error string
+     */
+    private void leafErrorMsgValidator(
+            YangRequestWorkBench bldr, String name, String val, String error) {
+        /*
+         * This try catch is explicitly written to use as utility in other
+         * test cases.
+         */
+        boolean isExpOccurred = false;
+        try {
+            bldr.addLeaf(name, LISTNS, val);
+        } catch (YdtException e) {
+            isExpOccurred = true;
+            assertEquals(e.getMessage(), error);
+        }
+        assertEquals(E_LEAF + name, isExpOccurred, true);
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/LogisticsManagerTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/LogisticsManagerTest.java
new file mode 100644
index 0000000..a64c4c4
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/LogisticsManagerTest.java
@@ -0,0 +1,179 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static org.onosproject.yms.app.ydt.YdtTestUtils.logisticsManagerYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafListContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.walkINTree;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class LogisticsManagerTest {
+
+    // Logger list is used for walker testing.
+    private final List<String> logger = new ArrayList<>();
+
+    private Set<String> valueSet = new HashSet();
+
+    private static final String[] EXPECTED = {
+            "Entry Node is logisticsmanager.",
+            "Entry Node is customssupervisor.",
+            "Entry Node is supervisor.",
+            "Exit Node is supervisor.",
+            "Exit Node is customssupervisor.",
+            "Entry Node is merchandisersupervisor.",
+            "Entry Node is supervisor.",
+            "Exit Node is supervisor.",
+            "Exit Node is merchandisersupervisor.",
+            "Entry Node is materialsupervisor.",
+            "Entry Node is supervisor.",
+            "Entry Node is name.",
+            "Exit Node is name.",
+            "Entry Node is departmentId.",
+            "Exit Node is departmentId.",
+            "Exit Node is supervisor.",
+            "Entry Node is supervisor.",
+            "Entry Node is name.",
+            "Exit Node is name.",
+            "Entry Node is departmentId.",
+            "Exit Node is departmentId.",
+            "Exit Node is supervisor.",
+            "Exit Node is materialsupervisor.",
+            "Entry Node is purchasingsupervisor.",
+            "Entry Node is supervisor.",
+            "Entry Node is purchasing-specialist.",
+            "Exit Node is purchasing-specialist.",
+            "Entry Node is support.",
+            "Exit Node is support.",
+            "Exit Node is supervisor.",
+            "Exit Node is purchasingsupervisor.",
+            "Entry Node is warehousesupervisor.",
+            "Entry Node is supervisor.",
+            "Exit Node is supervisor.",
+            "Exit Node is warehousesupervisor.",
+            "Entry Node is tradingsupervisor.",
+            "Entry Node is supervisor.",
+            "Exit Node is supervisor.",
+            "Exit Node is tradingsupervisor.",
+            "Entry Node is employeeid.",
+            "Entry Node is employeeid.",
+            "Exit Node is employeeid.",
+            "Exit Node is employeeid.",
+            "Exit Node is logisticsmanager."
+    };
+
+    /**
+     * Creates and validates logistics manager ydt.
+     */
+    @Test
+    public void logisticsManagerTest() {
+        YangRequestWorkBench ydtBuilder = logisticsManagerYdt();
+        validateTree(ydtBuilder);
+        // walker test
+        walkINTree(ydtBuilder, EXPECTED);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+        valueSet.add("1");
+        valueSet.add("2");
+        valueSet.add("3");
+        valueSet.add("4");
+        valueSet.add("5");
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "logisticsmanager", null);
+
+        ydtNode = ydtNode.getFirstChild();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "customssupervisor", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "supervisor", "abc");
+
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "merchandisersupervisor", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "supervisor", "abc");
+
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "materialsupervisor", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "supervisor", MERGE);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "name", "abc");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "departmentId", "xyz");
+
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "supervisor", MERGE);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "name", "ab");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "departmentId", "xy");
+
+        ydtNode = ydtNode.getParent().getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "purchasingsupervisor", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "supervisor", MERGE);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "purchasing-specialist", "abc");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "support", "xyz");
+
+        ydtNode = ydtNode.getParent().getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "warehousesupervisor", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafListContents(ydtNode, "supervisor", valueSet);
+
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "tradingsupervisor", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "supervisor", "abc");
+
+        ydtNode = ydtNode.getParent();
+
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "employeeid", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafListContents(ydtNode, "employeeid", valueSet);
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/MockYangSchemaRegistry.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/MockYangSchemaRegistry.java
new file mode 100644
index 0000000..8df66e9
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/MockYangSchemaRegistry.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.onosproject.yangutils.datamodel.YangSchemaNode;
+import org.onosproject.yms.app.ynh.YangNotificationExtendedService;
+import org.onosproject.yms.app.ysr.DefaultYangSchemaRegistry;
+import org.onosproject.yms.app.ysr.TestYangSchemaNodeProvider;
+import org.onosproject.yms.app.ysr.YangSchemaRegistry;
+
+import static org.junit.Assert.assertEquals;
+
+
+/**
+ * Represent Yang schema registry. Yang schema registry provides
+ * interface to an application to register its YANG
+ * schema with YMS. It provides YANG schema nodes to YDT, YNB and YSB.
+ */
+public class MockYangSchemaRegistry implements YangSchemaRegistry {
+
+
+    @Override
+    public void registerApplication(
+            Object managerObject,
+            Class<?> serviceClass,
+            YangNotificationExtendedService notificationExtendedService) {
+    }
+
+    @Override
+    public void unRegisterApplication(Object managerObject,
+                                      Class<?> serviceClass) {
+    }
+
+    @Override
+    public Object getRegisteredApplication(YangSchemaNode yangSchemaNode) {
+        return null;
+    }
+
+    @Override
+    public YangSchemaNode getYangSchemaNodeUsingAppName(String schemaName) {
+        return null;
+    }
+
+    @Override
+    public YangSchemaNode getYangSchemaNodeUsingSchemaName(String appName) {
+
+        final String target = "target/TestYangSchemaNodeProvider";
+        TestYangSchemaNodeProvider testYangSchemaNodeProvider =
+                new TestYangSchemaNodeProvider();
+
+        String searchDir = "src/test/resources/ydtTestYangFiles/";
+
+        testYangSchemaNodeProvider.processSchemaRegistry(null);
+
+        DefaultYangSchemaRegistry registry = testYangSchemaNodeProvider
+                .getDefaultYangSchemaRegistry();
+        YangSchemaNode yangNode = registry
+                .getYangSchemaNodeUsingSchemaName(appName);
+        assertEquals(appName, yangNode.getName());
+        return yangNode;
+    }
+
+    @Override
+    public YangSchemaNode
+    getYangSchemaNodeUsingGeneratedRootNodeInterfaceFileName(
+            String rootInterfaceFileName) {
+        return null;
+    }
+
+    @Override
+    public YangSchemaNode getYangSchemaNodeUsingGeneratedRootNodeOpPramFileName(
+            String rootOpParamFileName) {
+        return null;
+    }
+
+    @Override
+    public YangSchemaNode getRootYangSchemaNodeForNotification(
+            String eventSubject) {
+        return null;
+    }
+
+    @Override
+    public Class<?> getRegisteredClass(YangSchemaNode schemaNode,
+                                       String appName) {
+        return null;
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/RpcTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/RpcTest.java
new file mode 100644
index 0000000..8ca52c1
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/RpcTest.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.onosproject.yms.app.ydt.YdtTestUtils.helloOnos;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.walkINTree;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class RpcTest {
+
+    // Logger list is used for walker testing.
+    private final List<String> logger = new ArrayList<>();
+
+    private static final String[] EXPECTED = {
+            "Entry Node is Hello-ONOS.",
+            "Entry Node is Hello_ONOS.",
+            "Entry Node is hello-world.",
+            "Entry Node is input.",
+            "Entry Node is name.",
+            "Exit Node is name.",
+            "Entry Node is surName.",
+            "Exit Node is surName.",
+            "Entry Node is stringList.",
+            "Entry Node is string1.",
+            "Exit Node is string1.",
+            "Entry Node is string2.",
+            "Exit Node is string2.",
+            "Exit Node is stringList.",
+            "Exit Node is input.",
+            "Exit Node is hello-world.",
+            "Exit Node is Hello_ONOS.",
+            "Exit Node is Hello-ONOS."
+    };
+
+    /**
+     * Creates and validates hello onos ydt.
+     */
+    @Test
+    public void rpc1Test() {
+        YangRequestWorkBench ydtBuilder = helloOnos();
+        validateTree(ydtBuilder);
+        // walker test
+        walkINTree(ydtBuilder, EXPECTED);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "Hello-ONOS", null);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "Hello_ONOS", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "hello-world", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "input", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "name", "onos");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "surName", "yang");
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "stringList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "string1", "ON");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "string2", "LAB");
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtBitTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtBitTest.java
new file mode 100644
index 0000000..5446b51
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtBitTest.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+
+import static org.onosproject.yms.app.ydt.YdtTestConstants.BIT;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.BITNS;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.bitYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateErrMsg;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtBitTest {
+
+    /*
+        BINARY
+
+        Positive scenario
+        input with position 0
+        input with position 1
+        input with position 2
+    */
+
+    /**
+     * Creates and validates bit ydt covering different positive scenario.
+     */
+    @Test
+    public void positiveTest() {
+        YangRequestWorkBench ydtBuilder = bitYdt();
+        validateTree(ydtBuilder);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "builtInType", null);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "bit", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "bitList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "bit", "disable-nagle");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "bitList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "bit", "auto-sense-speed");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "bitList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "bit", "ten-Mb-only");
+    }
+
+    /*
+        Negative scenario
+
+        input with position 0
+        input with position 1
+        input with position 2
+    */
+
+    /**
+     * Tests all the negative scenario's for bit data type.
+     */
+    @Test
+    public void negativeTest() {
+        validateErrMsg("bit", BITNS, "0", BIT, "bitList");
+        validateErrMsg("bit", BITNS, "default", BIT, "bitList");
+        validateErrMsg("bit", BITNS, "1", BIT, "bitList");
+        validateErrMsg("bit", BITNS, "", BIT, "bitList");
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtBooleanTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtBooleanTest.java
new file mode 100644
index 0000000..505c640
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtBooleanTest.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+
+import static org.onosproject.yms.app.ydt.YdtTestConstants.BOOL;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.BOOLNS;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.booleanYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateErrMsg;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtBooleanTest {
+
+    /*
+        BOOLEAN
+        Positive scenario
+        input with in "booleanList" and false
+    */
+
+    /**
+     * Creates and validates boolean ydt covering different positive scenario.
+     */
+    @Test
+    public void positiveTest() {
+        YangRequestWorkBench ydtBuilder = booleanYdt();
+        validateTree(ydtBuilder);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, "builtInType", null);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "bool", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "booleanList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "boolean", "true");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "booleanList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "boolean", "false");
+    }
+
+    /*
+        Negative scenario
+
+        input with in non zero value in case of "booleanList"
+        input with zero value in case of false
+        input with empty value in case of false
+    */
+
+    /**
+     * Tests all the negative scenario's for boolean data type.
+     */
+    @Test
+    public void negativeTest() {
+        validateErrMsg("boolean", BOOLNS, "10", BOOL, "booleanList");
+        validateErrMsg("boolean", BOOLNS, "0", BOOL, "booleanList");
+        validateErrMsg("boolean", BOOLNS, "", BOOL, "booleanList");
+        validateErrMsg("boolean", BOOLNS, "-1", BOOL, "booleanList");
+        validateErrMsg("boolean", BOOLNS, "tru", BOOL, "booleanList");
+        validateErrMsg("boolean", BOOLNS, "boolean", BOOL, "booleanList");
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtDecimal64Test.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtDecimal64Test.java
new file mode 100644
index 0000000..1d15d04
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtDecimal64Test.java
@@ -0,0 +1,193 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.B;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.C;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.E;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.F;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.G;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.H;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MIDIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MRV;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.NIWMF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.NWF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.PIWMF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.PWF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TYPE;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.decimal64Ydt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtDecimal64Test {
+
+    /*
+
+    Positive scenario
+
+    input at boundry for decimal64 with fraction 2
+        i. min value
+        ii. max value
+
+    input at boundry for decimal64 with minimum fraction
+        i. min value
+        ii. mid value
+        iii. max value
+
+    input at boundry for decimal64 with maximum fraction
+        i. min value
+        ii. mid value
+        iii. max value
+
+    input with in range
+        if range is 10 to 100 for integer
+            i.1. input 11
+            i.2. min value 10
+            i.3. max value 100
+
+    input with multi interval range
+        if range is 10..40 | 50..100 for decimal64
+            i.1. input 11
+            i.2. input 10
+            i.3. input 40
+            i.4. input 50
+            i.5. input 55
+            i.6. input 100
+
+        if range is "min .. 3.14 | 10 | 20..max" for decimal64
+            i.1. input min
+            i.2. input 2.505
+            i.3. input 3.14
+            i.4. input 10
+            i.5. input 20
+            i.6. input 92233720368547757
+            i.7. input 92233720368547758.07
+
+    */
+
+    /**
+     * Creates and validates decimal64 ydt covering different positive scenario.
+     */
+    @Test
+    public void positiveTest() throws YdtException {
+        YangRequestWorkBench ydtBuilder = decimal64Ydt();
+        validateTree(ydtBuilder);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, TYPE, null);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "decimal64", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "negInt", C);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "posInt", A);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, NIWMF, F);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, PIWMF, G);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, NWF, H);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, PWF, E);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MIDIWR, "11");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MINIWR, "10");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MAXIWR, "100");
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "decimal", "11");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "decimal", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "decimal", "40");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "decimal", "50");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "decimal", "55");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "decimal", "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revDecimal", C);
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revDecimal", "2.505");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revDecimal", "3.14");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revDecimal", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revDecimal", "20");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revDecimal", B);
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revDecimal", A);
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtEmptyTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtEmptyTest.java
new file mode 100644
index 0000000..ea5ee34
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtEmptyTest.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+
+import static org.onosproject.yms.app.ydt.YdtTestConstants.EMPTY;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.EMPTYNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TYPE;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.emptyTypeYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateErrMsg;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtEmptyTest {
+
+    /*
+        EMPTY
+        Positive scenario
+        input with in empty.
+    */
+
+    /**
+     * Creates and validates empty ydt covering different positive scenario.
+     */
+    @Test
+    public void positiveTest() throws YdtException {
+        YangRequestWorkBench ydtBuilder = emptyTypeYdt();
+        validateTree(ydtBuilder);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, TYPE, null);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "emptydata", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "emptyList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "empty", "");
+    }
+
+    /*
+        Negative scenario
+
+        input with " "
+        input with "tab"
+        input with """"
+    */
+
+    /**
+     * Tests all the negative scenario's for empty data type.
+     */
+    @Test
+    public void negativeTest() throws YdtException {
+        validateErrMsg("empty", EMPTYNS, " ", EMPTY, "emptyList");
+        validateErrMsg("empty", EMPTYNS, "    ", EMPTY, "emptyList");
+        validateErrMsg("empty", EMPTYNS, " ", EMPTY, "emptyList");
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtEnumTest.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtEnumTest.java
new file mode 100644
index 0000000..77c2f81
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtEnumTest.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+
+import static org.onosproject.yms.app.ydt.YdtTestConstants.ENUM;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.ENUMNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TYPE;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.enumYdt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateErrMsg;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtEnumTest {
+
+/*
+    ENUM
+
+    Positive scenario
+
+        input with in enum
+        input with "ten"
+        input with "hundred"
+        input with "thousand"
+*/
+
+    /**
+     * Creates and validates enum ydt covering different positive scenario.
+     */
+    @Test
+    public void positiveTest() throws YdtException {
+        YangRequestWorkBench ydtBuilder = enumYdt();
+        validateTree(ydtBuilder);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, TYPE, null);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "enumtest", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "enumList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "enumleaf", "ten");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "enumList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "enumleaf", "hundred");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, "enumList", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "enumleaf", "thousand");
+    }
+
+    /*
+        Negative scenario
+
+        input with "10"
+        input with "thousands"
+    */
+
+    /**
+     * Tests all the negative scenario's for enum data type.
+     */
+    @Test
+    public void negativeTest() throws YdtException {
+        validateErrMsg("enumleaf", ENUMNS, "10", ENUM, "enumList");
+        validateErrMsg("enumleaf", ENUMNS, "thousands", ENUM, "enumList");
+        validateErrMsg("enumleaf", ENUMNS, "enumeration", ENUM, "enumList");
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger16Test.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger16Test.java
new file mode 100644
index 0000000..172732b
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger16Test.java
@@ -0,0 +1,392 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSUINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INT16NS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MIDIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MIDUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINVALUE;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MRV;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.RUI;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SUINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TYPE;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.integer16Ydt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateErrMsg;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtInteger16Test {
+
+    /*
+    Positive scenario
+
+    input at boundry for integer
+        i. min value
+        ii. max value
+
+    input at boundry for uinteger
+        i. min value
+        ii. max value
+
+    input with in range
+        if range is 10 to 100 for integer
+            i.1. input 11
+            i.2. min value 10
+            i.3. max value 100
+
+        if range is 10 to 100 for uinteger
+            i.1. input 11
+            i.2. min value 10
+            i.3. max value 100
+
+    input with multi interval range
+        if range is 10..40 | 50..100 for integer
+            i.1. input 11
+            i.2. input 10
+            i.3. input 40
+            i.4. input 50
+            i.5. input 55
+            i.6. input 100
+
+        if range is 10..40 | 50..100 for uinteger
+            i.1. input 11
+            i.2. input 10
+            i.3. input 40
+            i.4. input 50
+            i.5. input 55
+            i.6. input 100
+
+        if range is "min .. 2 | 10 | 20..max" for integer
+            i.1. input -32768
+            i.2. input 1
+            i.3. input 2
+            i.4. input 10
+            i.5. input 20
+            i.6. input 100
+            i.7. input 32767
+
+         if range is "min .. 2 | 10 | 20..max" for uInteger
+            i.1. input 0
+            i.2. input 1
+            i.3. input 2
+            i.4. input 10
+            i.5. input 20
+            i.6. input 100
+            i.7. input 65535
+    */
+
+    /**
+     * Creates and validates integer16 ydt covering different positive scenario.
+     */
+    @Test
+    public void positiveTest() throws YdtException {
+        YangRequestWorkBench ydtBuilder = integer16Ydt();
+        validateTree(ydtBuilder);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, TYPE, null);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "integer16", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "negInt", "-32768");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "posInt", "32767");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "minUInt", "0");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "maxUInt", "65535");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MIDIWR, "11");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MINIWR, "10");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MAXIWR, "100");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MIDUIWR, "11");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MINUIWR, "10");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MAXUIWR, "100");
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "11");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "40");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "50");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "55");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "11");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "40");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "50");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "55");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "100");
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "-32768");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "1");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+
+        validate1Tree(ydtNode);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validate1Tree(YdtNode ydtNode) {
+
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "20");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "32767");
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "0");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "1");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "20");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "65535");
+    }
+
+    /*
+        Negative scenario
+
+        wrong type input
+            i. input string instead of integer
+            ii. input string instead of uinteger
+
+    input out of range
+        i. input for int 8 range -32768 to 32767
+        i.1. input -32769
+        i.2. input 32768
+
+        ii. input for uint 8 range 0 to 65535
+        ii.1. input -32769
+        ii.2. input 65536
+
+        input out of range parameter
+            if range is 10 to 100 for int
+                i.1. input 9
+                i.2. input 101
+
+            if range is 10 to 100 for uInt
+                i.1. input 9
+                i.2. input 101
+
+        input with multi interval range
+        if range is 10..40 | 50..100 for integer
+            i.1. input 9
+            i.2. input 41
+            i.3. input 49
+            i.4. input 101
+
+        if range is 10..40 | 50..100 for uinteger
+            i.1. input 9
+            i.2. input 41
+            i.3. input 49
+            i.4. input 101
+
+        input with multi interval range
+        if range is min ..  | 10 | 20..max for integer
+            i.1. input -32769
+            i.2. input 4
+            i.3. input 9
+            i.4. input 11
+            i.5. input 19
+            i.6. input 32768
+
+        if range is min .. 3 | 10 | 20..max for uinteger
+            i.1. input -32769
+            i.2. input 4
+            i.3. input 9
+            i.4. input 11
+            i.5. input 19
+            i.6. input 65536
+
+    */
+
+    /**
+     * Tests all the negative scenario's for integer8 data type.
+     */
+    @Test
+    public void negative1Test() throws YdtException {
+        validateErrMsg("posInt", INT16NS, "integer", SINT16, null);
+        validateErrMsg("posInt", INT16NS, "integer", SINT16, null);
+        validateErrMsg("posInt", INT16NS, "127.0", SINT16, null);
+        validateErrMsg("maxUInt", INT16NS, "integer", SUINT16, null);
+        validateErrMsg("maxUInt", INT16NS, "127.0", SUINT16, null);
+        validateErrMsg("negInt", INT16NS, "-32769", SINT16, null);
+        validateErrMsg("posInt", INT16NS, "32768", SINT16, null);
+        validateErrMsg("minUInt", INT16NS, "-32769", MINVALUE, null);
+        validateErrMsg("maxUInt", INT16NS, "65536", MAXUINT16, null);
+        validateErrMsg(MINIWR, INT16NS, "9", CAPSINT16, null);
+        validateErrMsg(MAXIWR, INT16NS, "101", CAPSINT16, null);
+        validateErrMsg(MINUIWR, INT16NS, "9", CAPSUINT16, null);
+        validateErrMsg(MAXUIWR, INT16NS, "101", CAPSUINT16, null);
+
+        validateErrMsg("integer", INT16NS, "9", CAPSINT16, MRV);
+        validateErrMsg("integer", INT16NS, "41", CAPSINT16, MRV);
+        validateErrMsg("integer", INT16NS, "49", CAPSINT16, MRV);
+        validateErrMsg("integer", INT16NS, "101", CAPSINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "9", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "41", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "49", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "101", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "9", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "41", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "49", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "101", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "9", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "41", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "49", CAPSUINT16, MRV);
+        validateErrMsg("UnInteger", INT16NS, "101", CAPSUINT16, MRV);
+        validateErrMsg("revInteger", INT16NS, "-32769", SINT16, MRV);
+        validateErrMsg("revInteger", INT16NS, "19", CAPSINT16, MRV);
+        validateErrMsg("revInteger", INT16NS, "4", CAPSINT16, MRV);
+        validateErrMsg("revInteger", INT16NS, "32768", SINT16, MRV);
+        validateErrMsg("revInteger", INT16NS, "9", CAPSINT16, MRV);
+        validateErrMsg("revInteger", INT16NS, "11", CAPSINT16, MRV);
+        validateErrMsg(RUI, INT16NS, "-32769", MINVALUE, MRV);
+        validateErrMsg(RUI, INT16NS, "4", CAPSUINT16, MRV);
+        validateErrMsg(RUI, INT16NS, "9", CAPSUINT16, MRV);
+        validateErrMsg(RUI, INT16NS, "11", CAPSUINT16, MRV);
+        validateErrMsg(RUI, INT16NS, "19", CAPSUINT16, MRV);
+        validateErrMsg(RUI, INT16NS, "65536", MAXUINT16, MRV);
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger32Test.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger32Test.java
new file mode 100644
index 0000000..dd40ef5
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger32Test.java
@@ -0,0 +1,390 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSUINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INT32NS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MIDIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MIDUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINVALUE;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MRV;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.RUI;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SUINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TYPE;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.integer32Ydt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateErrMsg;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtInteger32Test {
+
+    /*
+    Positive scenario
+
+    input at boundry for integer
+        i. min value
+        ii. max value
+
+    input at boundry for uinteger
+        i. min value
+        ii. max value
+
+    input with in range
+        if range is 10 to 100 for integer
+            i.1. input 11
+            i.2. min value 10
+            i.3. max value 100
+
+        if range is 10 to 100 for uinteger
+            i.1. input 11
+            i.2. min value 10
+            i.3. max value 100
+
+    input with multi interval range
+        if range is 10..40 | 50..100 for integer
+            i.1. input 11
+            i.2. input 10
+            i.3. input 40
+            i.4. input 50
+            i.5. input 55
+            i.6. input 100
+
+        if range is 10..40 | 50..100 for uinteger
+            i.1. input 11
+            i.2. input 10
+            i.3. input 40
+            i.4. input 50
+            i.5. input 55
+            i.6. input 100
+
+        if range is "min .. 2 | 10 | 20..max" for integer
+            i.1. input -2147483648
+            i.2. input 1
+            i.3. input 2
+            i.4. input 10
+            i.5. input 20
+            i.6. input 100
+            i.7. input 2147483647
+
+         if range is "min .. 2 | 10 | 20..max" for uInteger
+            i.1. input 0
+            i.2. input 1
+            i.3. input 2
+            i.4. input 10
+            i.5. input 20
+            i.6. input 100
+            i.7. input 4294967295
+    */
+
+    /**
+     * Creates and validates integer32 ydt covering different positive scenario.
+     */
+    @Test
+    public void positiveTest() throws YdtException {
+        YangRequestWorkBench ydtBuilder = integer32Ydt();
+        validateTree(ydtBuilder);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, TYPE, null);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "integer32", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "negInt", "-2147483648");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "posInt", "2147483647");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "minUInt", MINVALUE);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "maxUInt", MAXUINT32);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MIDIWR, "11");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MINIWR, "10");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MAXIWR, "100");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MIDUIWR, "11");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MINUIWR, "10");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MAXUIWR, "100");
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "11");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "40");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "50");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "55");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "11");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "40");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "50");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "55");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "100");
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "-2147483648");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "1");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "20");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+
+        validate1Tree(ydtNode);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validate1Tree(YdtNode ydtNode) {
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "2147483647");
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, MINVALUE);
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "1");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "20");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, MAXUINT32);
+    }
+
+    /*
+        Negative scenario
+
+        wrong type input
+            i. input string instead of integer
+            ii. input string instead of uinteger
+
+        input out of range
+            i. input for int 8 range -2147483648 to 2147483647
+            i.1. input -2147483649
+            i.2. input 2147483648
+
+            ii. input for uint 8 range 0 to 4294967295
+            ii.1. input -2147483649
+            ii.2. input 4294967296
+
+            input out of range parameter
+                if range is 10 to 100 for int
+                    i.1. input 9
+                    i.2. input 101
+
+                if range is 10 to 100 for uInt
+                    i.1. input 9
+                    i.2. input 101
+
+            input with multi interval range
+            if range is 10..40 | 50..100 for integer
+                i.1. input 9
+                i.2. input 41
+                i.3. input 49
+                i.4. input 101
+
+            if range is 10..40 | 50..100 for uinteger
+                i.1. input 9
+                i.2. input 41
+                i.3. input 49
+                i.4. input 101
+
+            input with multi interval range
+            if range is min ..  | 10 | 20..max for integer
+                i.1. input -2147483649
+                i.2. input 4
+                i.3. input 9
+                i.4. input 11
+                i.5. input 19
+                i.6. input 256
+
+            if range is min .. 3 | 10 | 20..max for uinteger
+                i.1. input -2147483649
+                i.2. input 4
+                i.3. input 9
+                i.4. input 11
+                i.5. input 19
+                i.6. input 4294967296
+
+        */
+
+    /**
+     * Tests all the negative scenario's for integer8 data type.
+     */
+    @Test
+    public void negativeTest() throws YdtException {
+        validateErrMsg("posInt", INT32NS, "integer", SINT32, null);
+        validateErrMsg("posInt", INT32NS, "127.0", SINT32, null);
+        validateErrMsg("maxUInt", INT32NS, "integer", SUINT32, null);
+        validateErrMsg("maxUInt", INT32NS, "127.0", SUINT32, null);
+        validateErrMsg("negInt", INT32NS, "-2147483649", SINT32, null);
+        validateErrMsg("posInt", INT32NS, "2147483648", SINT32, null);
+        validateErrMsg("minUInt", INT32NS, "-2147483649", MINVALUE, null);
+        validateErrMsg("maxUInt", INT32NS, "4294967296", MAXUINT32, null);
+        validateErrMsg(MINIWR, INT32NS, "9", CAPSINT32, null);
+        validateErrMsg(MAXIWR, INT32NS, "101", CAPSINT32, null);
+        validateErrMsg(MINUIWR, INT32NS, "9", CAPSUINT32, null);
+        validateErrMsg(MAXUIWR, INT32NS, "101", CAPSUINT32, null);
+
+        validateErrMsg("integer", INT32NS, "9", CAPSINT32, MRV);
+        validateErrMsg("integer", INT32NS, "41", CAPSINT32, MRV);
+        validateErrMsg("integer", INT32NS, "49", CAPSINT32, MRV);
+        validateErrMsg("integer", INT32NS, "101", CAPSINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "9", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "41", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "49", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "101", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "9", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "41", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "49", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "101", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "9", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "41", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "49", CAPSUINT32, MRV);
+        validateErrMsg("UnInteger", INT32NS, "101", CAPSUINT32, MRV);
+        validateErrMsg("revInteger", INT32NS, "-2147483649", SINT32, MRV);
+        validateErrMsg("revInteger", INT32NS, "4", CAPSINT32, MRV);
+        validateErrMsg("revInteger", INT32NS, "9", CAPSINT32, MRV);
+        validateErrMsg("revInteger", INT32NS, "11", CAPSINT32, MRV);
+        validateErrMsg("revInteger", INT32NS, "19", CAPSINT32, MRV);
+        validateErrMsg("revInteger", INT32NS, "2147483648", SINT32, MRV);
+        validateErrMsg(RUI, INT32NS, "-2147483649", MINVALUE, MRV);
+        validateErrMsg(RUI, INT32NS, "4", CAPSUINT32, MRV);
+        validateErrMsg(RUI, INT32NS, "9", CAPSUINT32, MRV);
+        validateErrMsg(RUI, INT32NS, "11", CAPSUINT32, MRV);
+        validateErrMsg(RUI, INT32NS, "19", CAPSUINT32, MRV);
+        validateErrMsg(RUI, INT32NS, "4294967296", MAXUINT32, MRV);
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger64Test.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger64Test.java
new file mode 100644
index 0000000..136381d
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger64Test.java
@@ -0,0 +1,397 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSUINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.I;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INT64NS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.J;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.K;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.M;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MIDIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MIDUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINVALUE;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MRV;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.RUI;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SMALLINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SMALLUINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TYPE;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.integer64Ydt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateErrMsg;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtInteger64Test {
+
+    /*
+
+    Positive scenario
+
+    input at boundry for integer
+        i. min value
+        ii. max value
+
+    input at boundry for uinteger
+        i. min value
+        ii. max value
+
+    input with in range
+        if range is 10 to 100 for integer
+            i.1. input 11
+            i.2. min value 10
+            i.3. max value 100
+
+        if range is 10 to 100 for uinteger
+            i.1. input 11
+            i.2. min value 10
+            i.3. max value 100
+
+    input with multi interval range
+        if range is 10..40 | 50..100 for integer
+            i.1. input 11
+            i.2. input 10
+            i.3. input 40
+            i.4. input 50
+            i.5. input 55
+            i.6. input 100
+
+        if range is 10..40 | 50..100 for uinteger
+            i.1. input 11
+            i.2. input 10
+            i.3. input 40
+            i.4. input 50
+            i.5. input 55
+            i.6. input 100
+
+        if range is "min .. 2 | 10 | 20..max" for integer
+            i.1. input -9223372036854775808
+            i.2. input 1
+            i.3. input 2
+            i.4. input 10
+            i.5. input 20
+            i.6. input 100
+            i.7. input 9223372036854775807
+
+         if range is "min .. 2 | 10 | 20..max" for uInteger
+            i.1. input 0
+            i.2. input 1
+            i.3. input 2
+            i.4. input 10
+            i.5. input 20
+            i.6. input 100
+            i.7. input 18446744073709551615
+    */
+
+    /**
+     * Creates and validates integer64 ydt covering different positive scenario.
+     */
+    @Test
+    public void positiveTest() throws YdtException {
+        YangRequestWorkBench ydtBuilder = integer64Ydt();
+        validateTree(ydtBuilder);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, TYPE, null);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "integer64", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "negInt", K);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "posInt", J);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "minUInt", MINVALUE);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "maxUInt", MAXUINT64);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MIDIWR, "11");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MINIWR, "10");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MAXIWR, "100");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MIDUIWR, "11");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MINUIWR, "10");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MAXUIWR, "100");
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "11");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "40");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "50");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "55");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "11");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "40");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "50");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "55");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "100");
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", K);
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "1");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+
+        validate1Tree(ydtNode);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validate1Tree(YdtNode ydtNode) {
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "20");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", J);
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, MINVALUE);
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "1");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "20");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, MAXUINT64);
+    }
+
+    /*
+        Negative scenario
+
+        wrong type input
+            i. input string instead of integer
+            ii. input string instead of uinteger
+
+        input out of range
+            i. input for int 8 range -9223372036854775808 to 9223372036854775807
+            i.1. input -9223372036854775809
+            i.2. input 9223372036854775808
+
+            ii. input for uint 8 range 0 to 18446744073709551615
+            ii.1. input -9223372036854775809
+            ii.2. input 18446744073709551616
+
+        input out of range parameter
+            if range is 10 to 100 for int
+                i.1. input 9
+                i.2. input 101
+
+            if range is 10 to 100 for uInt
+                i.1. input 9
+                i.2. input 101
+
+        input with multi interval range
+        if range is 10..40 | 50..100 for integer
+            i.1. input 9
+            i.2. input 41
+            i.3. input 49
+            i.4. input 101
+
+        if range is 10..40 | 50..100 for uinteger
+            i.1. input 9
+            i.2. input 41
+            i.3. input 49
+            i.4. input 101
+
+        input with multi interval range
+        if range is min ..  | 10 | 20..max for integer
+            i.1. input -9223372036854775809
+            i.2. input 4
+            i.3. input 9
+            i.4. input 11
+            i.5. input 19
+            i.6. input 9223372036854775808
+
+        if range is min .. 3 | 10 | 20..max for uinteger
+            i.1. input -9223372036854775809
+            i.2. input 4
+            i.3. input 9
+            i.4. input 11
+            i.5. input 19
+            i.6. input 18446744073709551616
+
+    */
+
+    /**
+     * Tests all the negative scenario's for integer8 data type.
+     */
+    @Test
+    public void negativeTest() throws YdtException {
+        validateErrMsg("posInt", INT64NS, "integer", SMALLINT64, null);
+        validateErrMsg("posInt", INT64NS, "integer", SMALLINT64, null);
+        validateErrMsg("posInt", INT64NS, "127.0", SMALLINT64, null);
+        validateErrMsg("maxUInt", INT64NS, "integer", SMALLUINT64, null);
+        validateErrMsg("maxUInt", INT64NS, "127.0", SMALLUINT64, null);
+        validateErrMsg("negInt", INT64NS, L, SMALLINT64, null);
+        validateErrMsg("posInt", INT64NS, I, SMALLINT64, null);
+        validateErrMsg("minUInt", INT64NS, L, MINVALUE, null);
+        validateErrMsg("maxUInt", INT64NS, M, MAXUINT64, null);
+        validateErrMsg(MINIWR, INT64NS, "9", CAPSINT64, null);
+        validateErrMsg(MAXIWR, INT64NS, "101", CAPSINT64, null);
+        validateErrMsg(MINUIWR, INT64NS, "9", CAPSUINT64, null);
+        validateErrMsg(MAXUIWR, INT64NS, "101", CAPSUINT64, null);
+
+        validateErrMsg("integer", INT64NS, "9", CAPSINT64, MRV);
+        validateErrMsg("integer", INT64NS, "41", CAPSINT64, MRV);
+        validateErrMsg("integer", INT64NS, "49", CAPSINT64, MRV);
+        validateErrMsg("integer", INT64NS, "101", CAPSINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "9", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "41", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "49", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "101", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "9", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "41", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "49", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "101", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "9", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "41", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "49", CAPSUINT64, MRV);
+        validateErrMsg("UnInteger", INT64NS, "101", CAPSUINT64, MRV);
+        validateErrMsg("revInteger", INT64NS, L, SMALLINT64, MRV);
+        validateErrMsg("revInteger", INT64NS, "11", CAPSINT64, MRV);
+        validateErrMsg("revInteger", INT64NS, "4", CAPSINT64, MRV);
+        validateErrMsg("revInteger", INT64NS, "9", CAPSINT64, MRV);
+        validateErrMsg("revInteger", INT64NS, "19", CAPSINT64, MRV);
+        validateErrMsg("revInteger", INT64NS, I, SMALLINT64, MRV);
+        validateErrMsg(RUI, INT64NS, L, MINVALUE, MRV);
+        validateErrMsg(RUI, INT64NS, "4", CAPSUINT64, MRV);
+        validateErrMsg(RUI, INT64NS, "9", CAPSUINT64, MRV);
+        validateErrMsg(RUI, INT64NS, "11", CAPSUINT64, MRV);
+        validateErrMsg(RUI, INT64NS, "19", CAPSUINT64, MRV);
+        validateErrMsg(RUI, INT64NS, M, MAXUINT64, MRV);
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger8Test.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger8Test.java
new file mode 100644
index 0000000..0658f26
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtInteger8Test.java
@@ -0,0 +1,389 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Test;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSUINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INT8NS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MIDIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MIDUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINUIWR;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINVALUE;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MRV;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.RUI;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SMALLINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SMALLUINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TYPE;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.integer8Ydt;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateErrMsg;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateLeafContents;
+import static org.onosproject.yms.app.ydt.YdtTestUtils.validateNodeContents;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtInteger8Test {
+
+    /*
+    Positive scenario
+
+    input at boundry for integer
+        i. min value
+        ii. max value
+
+    input at boundry for uinteger
+        i. min value
+        ii. max value
+
+    input with in range
+        if range is 10 to 100 for integer
+            i.1. input 11
+            i.2. min value 10
+            i.3. max value 100
+
+        if range is 10 to 100 for uinteger
+            i.1. input 11
+            i.2. min value 10
+            i.3. max value 100
+
+    input with multi interval range
+        if range is 10..40 | 50..100 for integer
+            i.1. input 11
+            i.2. input 10
+            i.3. input 40
+            i.4. input 50
+            i.5. input 55
+            i.6. input 100
+
+        if range is 10..40 | 50..100 for uinteger
+            i.1. input 11
+            i.2. input 10
+            i.3. input 40
+            i.4. input 50
+            i.5. input 55
+            i.6. input 100
+
+        if range is "min .. 2 | 10 | 20..max" for integer
+            i.1. input -128
+            i.2. input 1
+            i.3. input 2
+            i.4. input 10
+            i.5. input 20
+            i.6. input 100
+            i.7. input 127
+
+         if range is "min .. 2 | 10 | 20..max" for uInteger
+            i.1. input 0
+            i.2. input 1
+            i.3. input 2
+            i.4. input 10
+            i.5. input 20
+            i.6. input 100
+            i.7. input 255
+    */
+
+    /**
+     * Creates and validates integer8 ydt covering different positive scenario.
+     */
+    @Test
+    public void positiveTest() throws YdtException {
+        YangRequestWorkBench ydtBuilder = integer8Ydt();
+        validateTree(ydtBuilder);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validateTree(YangRequestWorkBench ydtBuilder) {
+
+        // assign root node to ydtNode for validating purpose.
+        YdtNode ydtNode = (YdtNode) ydtBuilder.getRootNode();
+        // Logical root node does not have operation type
+        validateNodeContents(ydtNode, TYPE, null);
+
+        ydtNode = ydtNode.getFirstChild();
+        validateNodeContents(ydtNode, "integer8", MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "negInt", "-128");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "posInt", "127");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "minUInt", MINVALUE);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, "maxUInt", MAXUINT8);
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MIDIWR, "11");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MINIWR, "10");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MAXIWR, "100");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MIDUIWR, "11");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MINUIWR, "10");
+        ydtNode = ydtNode.getNextSibling();
+        validateLeafContents(ydtNode, MAXUIWR, "100");
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "11");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "40");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "50");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "55");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "integer", "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "11");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "40");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "50");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "55");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "UnInteger", "100");
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "-128");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "1");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        validate1Tree(ydtNode);
+    }
+
+    /**
+     * Validates the given built ydt.
+     */
+    private void validate1Tree(YdtNode ydtNode) {
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "20");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, "revInteger", "127");
+
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, MINVALUE);
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "1");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "2");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "10");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "20");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, "100");
+        ydtNode = ydtNode.getParent();
+        ydtNode = ydtNode.getNextSibling();
+        validateNodeContents(ydtNode, MRV, MERGE);
+        ydtNode = ydtNode.getFirstChild();
+        validateLeafContents(ydtNode, RUI, MAXUINT8);
+    }
+
+    /*
+        Negative scenario
+
+        wrong type input
+            i. input string instead of integer
+            ii. input string instead of uinteger
+
+        input out of range
+            i. input for int 8 range -128 to 127
+            i.1. input -129
+            i.2. input 128
+
+            ii. input for uint 8 range 0 to 255
+            ii.1. input -128
+            ii.2. input 256
+
+        input out of range parameter
+            if range is 10 to 100 for int
+                i.1. input 9
+                i.2. input 101
+
+            if range is 10 to 100 for uInt
+                i.1. input 9
+                i.2. input 101
+
+        input with multi interval range
+        if range is 10..40 | 50..100 for integer
+            i.1. input 9
+            i.2. input 41
+            i.3. input 49
+            i.4. input 101
+
+        if range is 10..40 | 50..100 for uinteger
+            i.1. input 9
+            i.2. input 41
+            i.3. input 49
+            i.4. input 101
+
+        input with multi interval range
+        if range is min ..  | 10 | 20..max for integer
+            i.1. input -129
+            i.2. input 4
+            i.3. input 9
+            i.4. input 11
+            i.5. input 19
+            i.6. input 128
+
+        if range is min .. 3 | 10 | 20..max for uinteger
+            i.1. input -129
+            i.2. input 4
+            i.3. input 9
+            i.4. input 11
+            i.5. input 19
+            i.6. input 256
+
+    */
+
+    /**
+     * Tests all the negative scenario's for integer8 data type.
+     */
+    @Test
+    public void negativeTest() throws YdtException {
+        validateErrMsg("posInt", INT8NS, "integer", SMALLINT8, null);
+        validateErrMsg("posInt", INT8NS, "127.0", SMALLINT8, null);
+        validateErrMsg("maxUInt", INT8NS, "integer", SMALLUINT8, null);
+        validateErrMsg("maxUInt", INT8NS, "127.0", SMALLUINT8, null);
+        validateErrMsg("negInt", INT8NS, "-129", SMALLINT8, null);
+        validateErrMsg("posInt", INT8NS, "128", SMALLINT8, null);
+        validateErrMsg("minUInt", INT8NS, "-128", MINVALUE, null);
+        validateErrMsg("maxUInt", INT8NS, "256", MAXUINT8, null);
+        validateErrMsg(MINIWR, INT8NS, "9", CAPSINT8, null);
+        validateErrMsg(MAXIWR, INT8NS, "101", CAPSINT8, null);
+        validateErrMsg(MINUIWR, INT8NS, "9", CAPSUINT8, null);
+        validateErrMsg(MAXUIWR, INT8NS, "101", CAPSUINT8, null);
+
+        validateErrMsg("integer", INT8NS, "9", CAPSINT8, MRV);
+        validateErrMsg("integer", INT8NS, "41", CAPSINT8, MRV);
+        validateErrMsg("integer", INT8NS, "49", CAPSINT8, MRV);
+        validateErrMsg("integer", INT8NS, "101", CAPSINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "9", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "41", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "49", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "101", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "9", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "41", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "49", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "101", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "9", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "41", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "49", CAPSUINT8, MRV);
+        validateErrMsg("UnInteger", INT8NS, "101", CAPSUINT8, MRV);
+        validateErrMsg("revInteger", INT8NS, "-129", SMALLINT8, MRV);
+        validateErrMsg("revInteger", INT8NS, "128", SMALLINT8, MRV);
+        validateErrMsg("revInteger", INT8NS, "4", CAPSINT8, MRV);
+        validateErrMsg("revInteger", INT8NS, "11", CAPSINT8, MRV);
+        validateErrMsg("revInteger", INT8NS, "9", CAPSINT8, MRV);
+        validateErrMsg("revInteger", INT8NS, "19", CAPSINT8, MRV);
+        validateErrMsg(RUI, INT8NS, "-129", MINVALUE, MRV);
+        validateErrMsg(RUI, INT8NS, "4", CAPSUINT8, MRV);
+        validateErrMsg(RUI, INT8NS, "9", CAPSUINT8, MRV);
+        validateErrMsg(RUI, INT8NS, "11", CAPSUINT8, MRV);
+        validateErrMsg(RUI, INT8NS, "19", CAPSUINT8, MRV);
+        validateErrMsg(RUI, INT8NS, "256", MAXUINT8, MRV);
+    }
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtTestConstants.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtTestConstants.java
new file mode 100644
index 0000000..daa5ce3
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtTestConstants.java
@@ -0,0 +1,138 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yms.app.ydt;
+
+/**
+ * Represents common constant utility for YANG data tree UT framework.
+ */
+final class YdtTestConstants {
+
+    // No instantiation.
+    private YdtTestConstants() {
+    }
+
+    public static final String BACKSLASH = "\"";
+    public static final String PERIOD = ".";
+    public static final String A = "92233720368547758.07";
+    public static final String B = "92233720368547757";
+    public static final String C = "-92233720368547758.08";
+    public static final String D = "92233720368547757";
+    public static final String E = "9.223372036854775807";
+    public static final String F = "-922337203685477580.8";
+    public static final String G = "922337203685477580.7";
+    public static final String H = "-9.223372036854775808";
+    public static final String I = "9223372036854775808";
+    public static final String J = "9223372036854775807";
+    public static final String K = "-9223372036854775808";
+    public static final String L = "-9223372036854775809";
+    public static final String M = "18446744073709551616";
+    public static final String NWF = "negIntWithMaxFraction";
+    public static final String PWF = "posIntWithMaxFraction";
+    public static final String NIWMF = "negIntWithMinFraction";
+    public static final String PIWMF = "posIntWithMinFraction";
+    public static final String CAPSUINT8 = "UINT8";
+    public static final String CAPSINT8 = "INT8";
+    public static final String SMALLUINT8 = "uint8.";
+    public static final String SMALLINT8 = "int8.";
+    public static final String MAXUINT8 = "255";
+    public static final String CAPSUINT16 = "UINT16";
+    public static final String CAPSINT16 = "INT16";
+    public static final String SUINT16 = "uint16.";
+    public static final String SINT16 = "int16.";
+    public static final String MAXUINT16 = "65535";
+    public static final String CAPSUINT32 = "UINT32";
+    public static final String CAPSINT32 = "INT32";
+    public static final String SUINT32 = "uint32.";
+    public static final String SINT32 = "int32.";
+    public static final String MAXUINT32 = "4294967295";
+    public static final String CAPSUINT64 = "UINT64";
+    public static final String CAPSINT64 = "INT64";
+    public static final String SMALLUINT64 = "uint64.";
+    public static final String SMALLINT64 = "int64.";
+    public static final String MAXUINT64 = "18446744073709551615";
+    public static final String MINVALUE = "0";
+    public static final String MINIWR = "minIntWithRange";
+    public static final String MIDIWR = "midIntWithRange";
+    public static final String MAXIWR = "maxIntWithRange";
+    public static final String MINUIWR = "minUIntWithRange";
+    public static final String MIDUIWR = "midUIntWithRange";
+    public static final String MAXUIWR = "maxUIntWithRange";
+    public static final String MRV = "multiRangeValidation";
+    public static final String RUI = "revUnInteger";
+    public static final String TYPE = "builtInType";
+    public static final String INT8NS = "ydt.integer8";
+    public static final String BIT = "BITS";
+    public static final String BOOL = "BOOLEAN";
+    public static final String EMPTY = "";
+    public static final String ENUM = "ENUMERATION";
+    public static final String LIST = "List";
+    public static final String LWC = "listwithcontainer";
+    public static final String INV = "invalidinterval";
+    public static final String INT16NS = "ydt.integer16";
+    public static final String INT32NS = "ydt.integer32";
+    public static final String INT64NS = "ydt.integer64";
+    public static final String BITNS = "ydt.bit";
+    public static final String BOOLNS = "ydt.boolean";
+    public static final String EMPTYNS = "ydt.emptydata";
+    public static final String ENUMNS = "ydt.enumtest";
+    public static final String LISTNS = "ydt.rootlist";
+    public static final String A1 = "ydt.augment-topology1";
+    public static final String A2 = "ydt.augment-topology2";
+    public static final String A3 = "ydt.augment-topology3";
+    public static final String A4 = "ydt.augment-topology4";
+    public static final String A5 = "ydt.augment-topology5";
+    public static final String A6 = "ydt.augment-topology6";
+    public static final String A2L = "augment2leafList";
+    public static final String A5L = "augment5leafList";
+    public static final String A6L = "augment6leafList";
+    public static final String MATERIALNS = "ydt.material-supervisor";
+    public static final String PURCHASNS = "ydt.purchasing-supervisor";
+    public static final String WAREHNS = "ydt.warehouse-supervisor";
+    public static final String TRADNS = "ydt.trading-supervisor";
+    public static final String EMPNS = "ydt.employee-id";
+    public static final String COUSTOMNS = "ydt.customs-supervisor";
+    public static final String MERCHNS = "ydt.Merchandiser-supervisor";
+    public static final String STP = "supporting-termination-point";
+    public static final String SLINK = "supporting-link";
+    public static final String AUG1 = "/nd:networks/nd:network";
+    public static final String AUG2 = "/nd:networks/nd:network/nd:node";
+    public static final String AUG3 = "/nd:networks/nd:network/topo:link";
+    public static final String AUG4 = "/nd:networks/nd:network/nd:node/" +
+            "topo:t-point/supporting-termination-point";
+    public static final String AUG5 = "/nd:networks/nd:network/topo:link/" +
+            "aug2:augment2";
+    public static final String AUG6 = "/nd:networks/nd:network/nd:node/" +
+            "topo:t-point/supporting-termination-point/aug2:augment2";
+    public static final String AUG7 = "/nd:networks/nd:network/topo:link/" +
+            "aug2:augment2/aug3:augment3";
+    public static final String AUG8 = "/nd:networks/nd:network/topo:link/" +
+            "aug2:augment2/aug3:augment3/aug5:augment5";
+    public static final String AUG9 = "/nd:networks/nd:network/topo:link/" +
+            "aug2:augment2/aug5:augment5";
+    public static final String NETNS = "ydt.augmentNetwork";
+    public static final String IETFNS =
+            "urn:ietf:params:xml:ns:yang:ietf-network";
+    public static final String IETF = "yms-ietf-network";
+    public static final String TOPONS =
+            "urn:ietf:params:xml:ns:yang:ietf-network-topology";
+    public static final String E_LEAF = "Exception has not occurred for " +
+            "invalid leaf value with name ";
+    public static final String E_LIST = "Exception has not occurred for " +
+            "invalid node addition with the name ";
+    public static final String E_TOPARENT = "Exception has not occurred " +
+            "in traverse back to parent for multi instance node.";
+}
diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtTestUtils.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtTestUtils.java
new file mode 100644
index 0000000..f375c1a
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ydt/YdtTestUtils.java
@@ -0,0 +1,1792 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yms.app.ydt;
+
+import org.junit.Rule;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yms.app.ydt.exceptions.YdtException;
+import org.onosproject.yms.app.ysr.TestYangSchemaNodeProvider;
+import org.onosproject.yms.app.ysr.YangSchemaRegistry;
+import org.onosproject.yms.ydt.YdtContext;
+import org.onosproject.yms.ydt.YdtContextOperationType;
+import org.onosproject.yms.ydt.YdtListener;
+import org.onosproject.yms.ydt.YdtType;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A1;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A2;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A2L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A3;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A4;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A5;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A5L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A6;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.A6L;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.BACKSLASH;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.BIT;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.BITNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.BOOL;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.BOOLNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSUINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSUINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSUINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.CAPSUINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.COUSTOMNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.EMPNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.EMPTY;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.EMPTYNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.ENUM;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.ENUMNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.E_LEAF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.IETF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.IETFNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INT16NS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INT32NS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INT64NS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INT8NS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.INV;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.LIST;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.LISTNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.LWC;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MATERIALNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MAXUINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MERCHNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MINVALUE;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.MRV;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.NIWMF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.NWF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.PERIOD;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.PIWMF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.PURCHASNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.PWF;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SLINK;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SMALLINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SMALLINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SMALLUINT64;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SMALLUINT8;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.STP;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SUINT16;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.SUINT32;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TOPONS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TRADNS;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.TYPE;
+import static org.onosproject.yms.app.ydt.YdtTestConstants.WAREHNS;
+import static org.onosproject.yms.ydt.YdtContextOperationType.DELETE;
+import static org.onosproject.yms.ydt.YdtContextOperationType.MERGE;
+
+public class YdtTestUtils implements YdtListener {
+
+    private static List<String> kValList = new ArrayList<>();
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private static YangSchemaRegistry schemaRegistry;
+
+    private static TestYangSchemaNodeProvider schemaProvider =
+            new TestYangSchemaNodeProvider();
+
+    // Logger list is used for walker testing.
+    private static final List<String> LOGGER = new ArrayList<>();
+
+    /**
+     * Returns the LOGGER with log for testing the YDT walker.
+     *
+     * @return list of logs
+     */
+    public static List<String> getLogger() {
+        return LOGGER;
+    }
+
+    /**
+     * Clear the LOGGER array.
+     */
+    public static void resetLogger() {
+        LOGGER.clear();
+    }
+
+    @Override
+    public void enterYdtNode(YdtContext ydtContext) {
+        LOGGER.add("Entry Node is " + ydtContext.getName() + PERIOD);
+    }
+
+    @Override
+    public void exitYdtNode(YdtContext ydtContext) {
+        LOGGER.add("Exit Node is " + ydtContext.getName() + PERIOD);
+    }
+
+    /**
+     * Returns schema registry of YDT.
+     *
+     * @return schema registry
+     */
+    public static YangSchemaRegistry getSchemaRegistry() {
+        return schemaRegistry;
+    }
+
+    /**
+     * Sets the ydt schema registry.
+     *
+     * @param registry schema registry
+     */
+    public static void setSchemaRegistry(YangSchemaRegistry registry) {
+        schemaRegistry = registry;
+    }
+
+    /**
+     * Returns the ydt builder for food module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench foodArenaYdt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder("foodarena", "food", "ydt.food", MERGE);
+        ydtBuilder.addChild("food", "ydt.food");
+//        ydtBuilder.addChild("snack", null, "ydt.food");
+//        ydtBuilder.addChild("latenight", null, "ydt.food");
+        ydtBuilder.addLeaf("chocolate", "ydt.food", "dark");
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for yms-ietf-network module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench ietfNetwork1Ydt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(IETF, IETF, IETFNS, MERGE);
+        // Adding container
+        ydtBuilder.addChild("networks", null);
+        // Adding list inside container
+        ydtBuilder.addChild("network", null);
+        // Adding key element network Id
+        ydtBuilder.addLeaf("network-id", null, "network1");
+        ydtBuilder.traverseToParent();
+
+        // Adding list inside list
+        ydtBuilder.addChild("supporting-network", null);
+        // Adding key element network-ref
+        ydtBuilder.addLeaf("network-ref", null, "network2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // Adding list inside list
+        ydtBuilder.addChild("node", null);
+        // Adding key element node-id
+        ydtBuilder.addLeaf("node-id", null, "node1");
+        ydtBuilder.traverseToParent();
+
+        // Adding list inside list
+        ydtBuilder.addChild("supporting-node", null);
+        // Adding key element network-ref
+        ydtBuilder.addLeaf("network-ref", null, "network3");
+        ydtBuilder.traverseToParent();
+
+        // Adding key element node-ref
+        ydtBuilder.addLeaf("node-ref", null, "network4");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // Adding container
+        ydtBuilder.addChild("networks-state", null);
+        // Adding list inside container
+        ydtBuilder.addChild("network", null);
+        // Adding key element network-ref
+        ydtBuilder.addLeaf("network-ref", null, "network5");
+        ydtBuilder.traverseToParent();
+        // Adding leaf server-provided
+        ydtBuilder.addLeaf("server-provided", null, "true");
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for yms-ietf-network-topology module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench ietfNetworkTopologyYdt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(IETF, IETF, IETFNS, MERGE);
+        // Adding container
+        ydtBuilder.addChild("networks", IETFNS, MERGE);
+        // Adding list inside container
+        ydtBuilder.addChild("network", IETFNS, MERGE);
+
+        // Adding key element network Id
+        ydtBuilder.addLeaf("network-id", null, "network1");
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("id1");
+        // adding the augmented node
+        ydtBuilder.addMultiInstanceChild("link", TOPONS, kValList, MERGE);
+        // container source
+        ydtBuilder.addChild("source", TOPONS, MERGE);
+        ydtBuilder.addLeaf("source-node", null, "source1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("source-tp", null, "source2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // container destination
+        ydtBuilder.addChild("destination", TOPONS, MERGE);
+        ydtBuilder.addLeaf("dest-node", null, "dest1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("dest-tp", null, "dest2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("network1");
+        kValList.add("id2");
+        // adding the supporting-link list node
+        ydtBuilder.addMultiInstanceChild(SLINK, TOPONS, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("network2");
+        kValList.add("id3");
+        // adding the supporting-link list another instance
+        ydtBuilder.addMultiInstanceChild(SLINK, TOPONS, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // Adding list inside list
+        ydtBuilder.addChild("supporting-network", null);
+        // Adding key element network-ref
+        ydtBuilder.addLeaf("network-ref", null, "network2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // Adding list inside list
+        ydtBuilder.addChild("node", null);
+        // Adding key element node-id
+        ydtBuilder.addLeaf("node-id", null, "node1");
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("tp_id1");
+        //adding augmented termination-point list
+        ydtBuilder.addMultiInstanceChild("t-point", TOPONS,
+                                         kValList, MERGE);
+        kValList.clear();
+        kValList.add("network-ref");
+        kValList.add("node-ref");
+        kValList.add("tp-ref");
+        //adding supporting-termination-point
+        ydtBuilder.addMultiInstanceChild(STP, TOPONS, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // Adding list inside list
+        ydtBuilder.addChild("supporting-node", null);
+        // Adding key element network-ref
+        ydtBuilder.addLeaf("network-ref", null, "network3");
+        ydtBuilder.traverseToParent();
+
+        // Adding key element node-ref
+        ydtBuilder.addLeaf("node-ref", null, "network4");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("link-id", TOPONS, "id1");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // Adding container
+        ydtBuilder.addChild("networks-state", null);
+        // Adding list inside container
+        ydtBuilder.addChild("network", null);
+        // Adding key element network-ref
+        ydtBuilder.addLeaf("network-ref", null, "network5");
+        ydtBuilder.traverseToParent();
+        // Adding leaf server-provided
+        ydtBuilder.addLeaf("server-provided", null, "true");
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for augmented module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench augmentNetworkYdt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(IETF, IETF, IETFNS, MERGE);
+        // Adding container
+        ydtBuilder.addChild("networks", IETFNS, MERGE);
+        // Adding list inside container
+        ydtBuilder.addChild("network", IETFNS, MERGE);
+
+        // Adding key element network Id
+        ydtBuilder.addLeaf("network-id", null, "network1");
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("id1");
+        // adding the augmented node
+        ydtBuilder.addMultiInstanceChild("link", TOPONS, kValList, MERGE);
+        // container source
+        ydtBuilder.addChild("source", TOPONS, MERGE);
+        ydtBuilder.addLeaf("source-node", null, "source1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("source-tp", null, "source2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // container destination
+        ydtBuilder.addChild("destination", TOPONS, MERGE);
+        ydtBuilder.addLeaf("dest-node", null, "dest1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("dest-tp", null, "dest2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("network1");
+        kValList.add("id2");
+        // adding the supporting-link list node
+        ydtBuilder.addMultiInstanceChild(SLINK, TOPONS, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("network2");
+        kValList.add("id3");
+        // adding the supporting-link list another instance
+        ydtBuilder.addMultiInstanceChild(SLINK, TOPONS, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("1");
+        ydtBuilder.addMultiInstanceChild("augment1", A1, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("1");
+        kValList.add("2");
+        ydtBuilder.addMultiInstanceChild("augment2", A2, kValList, MERGE);
+
+        ydtBuilder.addChild("augment5", A5, DELETE);
+
+        ydtBuilder.addMultiInstanceChild(A6L, A6, kValList, DELETE);
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("value5", null, "5");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addMultiInstanceChild(A5L, A5, kValList, DELETE);
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("augment3", A3, MERGE);
+
+        ydtBuilder.addChild("augment4", A4, DELETE);
+        ydtBuilder.addLeaf("value4", null, "4");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("augment5", A5, MERGE);
+
+        ydtBuilder.addLeaf("leaf6", A6, "6");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("value5", null, "5");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("augment6", A6, DELETE);
+        ydtBuilder.addLeaf("value6", null, "6");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("value3", null, "3");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("augment3leaf", A3, "3");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addMultiInstanceChild(A2L, A2, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.traverseToParent();
+
+        // Adding list inside list
+        ydtBuilder.addChild("supporting-network", null);
+        // Adding key element network-ref
+        ydtBuilder.addLeaf("network-ref", null, "network2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // Adding list inside list
+        ydtBuilder.addChild("node", null);
+        // Adding key element node-id
+        ydtBuilder.addLeaf("node-id", null, "node1");
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("tp_id1");
+        //adding augmented termination-point list
+        ydtBuilder.addMultiInstanceChild("t-point", TOPONS,
+                                         kValList, MERGE);
+        kValList.clear();
+        kValList.add("network-ref");
+        kValList.add("node-ref");
+        kValList.add("tp-ref");
+        //adding supporting-termination-point
+        ydtBuilder.addMultiInstanceChild(STP, TOPONS, kValList, MERGE);
+
+        // Adding augmented container1 inside supporting-termination-point
+        augmentTerminationPointYdt(ydtBuilder);
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Adds augments inside supporting-termination-point in augmented module.
+     *
+     * @param ydtBuilder ydt builder which need to be updated
+     */
+    private static void augmentTerminationPointYdt(YangRequestWorkBench ydtBuilder) {
+
+        ydtBuilder.addChild("augment1", A1);
+        ydtBuilder.addLeaf("value1", null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("augment1-leaf", A1, "1");
+
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("augment2", A2, MERGE);
+
+        ydtBuilder.addChild("augment3", A3, MERGE);
+        ydtBuilder.addLeaf("value3", null, "3");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("augment4leaf", A4, "4");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("value2", null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("1");
+        kValList.add("2");
+        ydtBuilder.addMultiInstanceChild(A2L, A2, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("augment2leaf", A2, "2");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // Adding list inside list
+        ydtBuilder.addChild("supporting-node", null);
+        // Adding key element network-ref
+        ydtBuilder.addLeaf("network-ref", null, "network3");
+        ydtBuilder.traverseToParent();
+
+        // Adding key element node-ref
+        ydtBuilder.addLeaf("node-ref", null, "network4");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("link-id", TOPONS, "id1");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        // Adding container
+        ydtBuilder.addChild("networks-state", null);
+        // Adding list inside container
+        ydtBuilder.addChild("network", null);
+        // Adding key element network-ref
+        ydtBuilder.addLeaf("network-ref", null, "network5");
+        ydtBuilder.traverseToParent();
+        // Adding leaf server-provided
+        ydtBuilder.addLeaf("server-provided", null, "true");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+    }
+
+    /**
+     * Returns the ydt builder for rootlist module with listwithcontainer node
+     * using addMultiInstanceChild interface for adding multi instance node.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench listWithContainerYdt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder("list", "rootlist", "ydt.rootlist", MERGE);
+        kValList.clear();
+        kValList.add("12");
+        kValList.add("12");
+        ydtBuilder.addMultiInstanceChild(LWC, null, kValList, MERGE);
+        ydtBuilder.addLeaf(INV, null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(INV, null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild("interface", null);
+        ydtBuilder.addLeaf(INV, null, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid", null, "121");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for rootlist module with listwithcontainer
+     * node using addChild interface for adding multi instance node.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench listWithContainer1Ydt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder("list", "rootlist", "ydt.rootlist", MERGE);
+        ydtBuilder.addChild(LWC, null);
+        ydtBuilder.addLeaf("invalid", null, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid1", null, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(INV, null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(INV, null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild("interface", null);
+        ydtBuilder.addLeaf(INV, null, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("invalid", null, "121");
+        ydtBuilder.traverseToParent();
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for rootlist module with multiple instances of
+     * listwithcontainer node using addMultiInstanceChild interface for adding
+     * multi instance node.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench listWithContainer2Ydt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder("list", "rootlist", "ydt.rootlist", MERGE);
+        kValList.clear();
+        kValList.add("1222");
+        kValList.add("1212");
+        ydtBuilder.addMultiInstanceChild(LWC, null, kValList, MERGE);
+
+        kValList.clear();
+        kValList.add("12");
+        kValList.add("1");
+        ydtBuilder.addMultiInstanceChild(INV, null, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(INV, null, "122");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(INV, null, "2222");
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("1222");
+        kValList.add("1212");
+        ydtBuilder.addMultiInstanceChild(INV, null, kValList, MERGE);
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("interface", null);
+        ydtBuilder.addLeaf(INV, null, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for rootlist module with listwithoutcontainer
+     * node.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench listWithoutContainerYdt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder("list", "rootlist", "ydt.rootlist", MERGE);
+        ydtBuilder.addChild("listwithoutcontainer", null);
+        ydtBuilder.addLeaf(INV, null, "12");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for logisticsmanager module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench logisticsManagerYdt() {
+
+        Set<String> valueSet = new HashSet();
+        valueSet.add("1");
+        valueSet.add("2");
+        valueSet.add("3");
+        valueSet.add("4");
+        valueSet.add("5");
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder("logisticsmanager", "customssupervisor",
+                                   null, MERGE);
+        ydtBuilder.addLeaf("supervisor", COUSTOMNS, "abc");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("merchandisersupervisor", MERCHNS, MERGE);
+        ydtBuilder.addLeaf("supervisor", MERCHNS, "abc");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("materialsupervisor", MATERIALNS, MERGE);
+        ydtBuilder.addChild("supervisor", MATERIALNS);
+        ydtBuilder.addLeaf("name", MATERIALNS, "abc");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("departmentId", MATERIALNS, "xyz");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("supervisor", MATERIALNS);
+        ydtBuilder.addLeaf("name", MATERIALNS, "ab");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("departmentId", MATERIALNS, "xy");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("purchasingsupervisor", PURCHASNS, MERGE);
+        ydtBuilder.addChild("supervisor", PURCHASNS);
+        ydtBuilder.addLeaf("purchasing-specialist", PURCHASNS, "abc");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("support", "ydt.purchasing-supervisor", "xyz");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("warehousesupervisor", WAREHNS, MERGE);
+        ydtBuilder.addLeaf("supervisor", WAREHNS, valueSet);
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("tradingsupervisor", TRADNS, MERGE);
+        ydtBuilder.addLeaf("supervisor", TRADNS, "abc");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild("employeeid", EMPNS, MERGE);
+        ydtBuilder.addLeaf("employeeid", EMPNS, valueSet);
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for bit module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench bitYdt() {
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder("builtInType", "bit", "ydt.bit", MERGE);
+        ydtBuilder.addChild("bitList", null);
+        ydtBuilder.addLeaf("bit", null, "disable-nagle");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild("bitList", null);
+        ydtBuilder.addLeaf("bit", null, "auto-sense-speed");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild("bitList", null);
+        ydtBuilder.addLeaf("bit", null, "ten-Mb-only");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild("bitList", null);
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for bool module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench booleanYdt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder("builtInType", "bool", "ydt.boolean", MERGE);
+        ydtBuilder.addChild("booleanList", null);
+        ydtBuilder.addLeaf("boolean", null, "true");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild("booleanList", null);
+        ydtBuilder.addLeaf("boolean", null, "false");
+        ydtBuilder.traverseToParent();
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for emptydata module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench emptyTypeYdt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(
+                "builtInType", "emptydata", "ydt.emptydata", MERGE);
+        ydtBuilder.addChild("emptyList", null);
+        ydtBuilder.addLeaf("empty", null, "");
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for enumtest module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench enumYdt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(
+                "builtInType", "enumtest", "ydt.enumtest", MERGE);
+        ydtBuilder.addChild("enumList", null);
+        ydtBuilder.addLeaf("enumleaf", null, "ten");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild("enumList", null);
+        ydtBuilder.addLeaf("enumleaf", null, "hundred");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild("enumList", null);
+        ydtBuilder.addLeaf("enumleaf", null, "thousand");
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for builtin type integer8 module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench integer8Ydt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(
+                "builtInType", "integer8", "ydt.integer8", MERGE);
+        ydtBuilder.addLeaf("negInt", null, "-128");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("posInt", null, "127");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("minUInt", null, "0");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxUInt", null, "255");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("midIntWithRange", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("minIntWithRange", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxIntWithRange", null, "100");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("midUIntWithRange", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("minUIntWithRange", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxUIntWithRange", null, "100");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "40");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "50");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "55");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("UnInteger", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "40");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "50");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "55");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revInteger", null, "-128");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "20");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "127");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "0");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "20");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "255");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for builtin type integer16 module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench integer16Ydt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(
+                "builtInType", "integer16", "ydt.integer16", MERGE);
+        ydtBuilder.addLeaf("negInt", null, "-32768");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("posInt", null, "32767");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("minUInt", null, "0");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxUInt", null, "65535");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("midIntWithRange", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("minIntWithRange", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxIntWithRange", null, "100");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("midUIntWithRange", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("minUIntWithRange", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxUIntWithRange", null, "100");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "40");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "50");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "55");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("UnInteger", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "40");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "50");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "55");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revInteger", null, "-32768");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "20");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "32767");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "0");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "20");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "65535");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for builtin type integer32 module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench integer32Ydt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(
+                "builtInType", "integer32", "ydt.integer32", MERGE);
+        ydtBuilder.addLeaf("negInt", null, "-2147483648");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("posInt", null, "2147483647");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("minUInt", null, "0");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxUInt", null, "4294967295");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("midIntWithRange", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("minIntWithRange", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxIntWithRange", null, "100");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("midUIntWithRange", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("minUIntWithRange", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxUIntWithRange", null, "100");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "40");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "50");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "55");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("UnInteger", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "40");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "50");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "55");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revInteger", null, "-2147483648");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "20");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "2147483647");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "0");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "20");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "4294967295");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for builtin type integer64 module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench integer64Ydt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(
+                "builtInType", "integer64", "ydt.integer64", MERGE);
+        ydtBuilder.addLeaf("negInt", null, "-9223372036854775808");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("posInt", null, "9223372036854775807");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("minUInt", null, "0");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxUInt", null, "18446744073709551615");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("midIntWithRange", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("minIntWithRange", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxIntWithRange", null, "100");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addLeaf("midUIntWithRange", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("minUIntWithRange", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxUIntWithRange", null, "100");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "40");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "50");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "55");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("integer", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("UnInteger", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "40");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "50");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "55");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("UnInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revInteger", null, "-9223372036854775808");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "20");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revInteger", null, "9223372036854775807");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "0");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "1");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "2");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "20");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null, YdtType.MULTI_INSTANCE_NODE);
+        ydtBuilder.addLeaf("revUnInteger", null, "18446744073709551615");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder for builtin type decimal64 module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench decimal64Ydt() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(
+                "builtInType", "decimal64", "ydt.decimal64", MERGE);
+        ydtBuilder.addLeaf("negInt", null, "-92233720368547758.08");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("posInt", null, "92233720368547758.07");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(NIWMF, null, "-922337203685477580.8");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(PIWMF, null, "922337203685477580.7");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(NWF, null, "-9.223372036854775808");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf(PWF, null, "9.223372036854775807");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("midIntWithRange", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("minIntWithRange", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("maxIntWithRange", null, "100");
+        ydtBuilder.traverseToParent();
+
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("decimal", null, "11");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("decimal", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("decimal", null, "40");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("decimal", null, "50");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("decimal", null, "55");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("decimal", null, "100");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revDecimal", null, "-92233720368547758.08");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revDecimal", null, "2.505");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revDecimal", null, "3.14");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revDecimal", null, "10");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revDecimal", null, "20");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revDecimal", null, "92233720368547757");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addChild(MRV, null);
+        ydtBuilder.addLeaf("revDecimal", null, "92233720368547758.07");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the ydt builder with requested logical root name and module name.
+     *
+     * @param rootName   logical rootNode name
+     * @param moduleName application(module) name
+     * @param nameSpace  namespace of module
+     * @param opType     operation type
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench getYdtBuilder(String rootName, String
+            moduleName, String nameSpace, YdtContextOperationType opType) {
+        setSchemaRegistry(schemaProvider.getDefaultYangSchemaRegistry());
+        YangRequestWorkBench ydtBuilder;
+        schemaProvider.processSchemaRegistry(null);
+        ydtBuilder = new YangRequestWorkBench(
+                rootName, null, null, schemaProvider
+                .getDefaultYangSchemaRegistry(), true);
+        ydtBuilder.addChild(moduleName, nameSpace, opType);
+        return ydtBuilder;
+    }
+
+    /**
+     * Compares the two value sets.
+     */
+    public static void compareValueSet(Set<String> valueSet,
+                                       Set<String> userInputValueSet) {
+        // Check the value against user input.
+        assertTrue("Expected 'valueSet' and 'userInputValueSet' to be equal.",
+                   valueSet.containsAll(userInputValueSet));
+    }
+
+    /**
+     * Returns the ydt builder for Hello_ONOS module.
+     *
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench helloOnos() {
+
+        YangRequestWorkBench ydtBuilder;
+        ydtBuilder = getYdtBuilder(
+                "Hello-ONOS", "Hello_ONOS", "ydt:hello_onos", MERGE);
+        ydtBuilder.addChild("hello-world", null);
+        ydtBuilder.addChild("input", null);
+        ydtBuilder.addLeaf("name", null, "onos");
+        ydtBuilder.traverseToParent();
+        ydtBuilder.addLeaf("surName", null, "yang");
+        ydtBuilder.traverseToParent();
+
+        kValList.clear();
+        kValList.add("ON");
+        kValList.add("LAB");
+        ydtBuilder.addMultiInstanceChild("stringList", null, kValList,
+                                         MERGE);
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+        ydtBuilder.traverseToParent();
+
+        return ydtBuilder;
+    }
+
+    /**
+     * Returns the error message for requested node.
+     *
+     * @param value    value in string format
+     * @param dataType requested data type
+     * @return error string
+     */
+    static String getErrorString(String value, String dataType) {
+        StringBuilder msg = new StringBuilder();
+        switch (dataType) {
+            case SINT16:
+            case SINT32:
+            case SMALLINT8:
+            case SMALLINT64:
+            case SMALLUINT8:
+            case SMALLUINT64:
+            case SUINT16:
+            case SUINT32:
+            case CAPSINT8:
+            case CAPSINT16:
+            case CAPSINT32:
+            case CAPSINT64:
+            case CAPSUINT8:
+            case CAPSUINT16:
+            case CAPSUINT32:
+            case CAPSUINT64:
+            case BIT:
+            case BOOL:
+            case ENUM:
+                msg.append("YANG file error : Input value ").append(BACKSLASH)
+                        .append(value).append(BACKSLASH)
+                        .append(" is not a valid ").append(dataType);
+                break;
+            case EMPTY:
+                msg.append("YANG file error : Input value ").append(BACKSLASH)
+                        .append(value).append(BACKSLASH).append(
+                        " is not allowed for a data type EMPTY");
+                break;
+            case MINVALUE:
+                msg.append("YANG file error : ").append(value)
+                        .append(" is lesser than minimum value ")
+                        .append(MINVALUE).append(PERIOD);
+                break;
+            case MAXUINT8:
+            case MAXUINT16:
+            case MAXUINT32:
+            case MAXUINT64:
+                msg.append("YANG file error : ").append(value)
+                        .append(" is greater than maximum value ")
+                        .append(dataType).append(PERIOD);
+                break;
+            default:
+                return null;
+        }
+        return msg.toString();
+    }
+
+    /**
+     * Validates the error message which is obtained by checking the given
+     * value against its data type restrictions.
+     *
+     * @param name      leaf name
+     * @param nameSpace leaf namespace
+     * @param val       leaf value
+     * @param type      data type suffix string for exception message
+     * @param childName child name
+     */
+    public static void validateErrMsg(String name, String nameSpace,
+                                      String val, String type, String childName) {
+        YangRequestWorkBench ydtBuilder = getTestYdtBuilder(nameSpace);
+        boolean isExpOccurred = false;
+        /*
+         * If childName exist then leaf need to be added under the
+         * child node with the given childName
+         */
+        if (childName != null) {
+            ydtBuilder.addChild(childName, nameSpace);
+        }
+        /*
+         * This try catch is explicitly written to use as utility in other
+         * test cases.
+         */
+        try {
+            ydtBuilder.addLeaf(name, nameSpace, val);
+        } catch (YdtException e) {
+            isExpOccurred = true;
+            assertEquals(e.getMessage(), getErrorString(val, type));
+        }
+        assertEquals(E_LEAF + name, isExpOccurred, true);
+    }
+
+    /**
+     * Returns ydt builder for requested namespace.
+     *
+     * @param namespace namespace of the requested yang data tree
+     * @return ydt builder
+     */
+    public static YangRequestWorkBench getTestYdtBuilder(String namespace) {
+
+        switch (namespace) {
+            case INT8NS:
+                return getYdtBuilder(TYPE, "integer8", INT8NS, MERGE);
+            case INT16NS:
+                return getYdtBuilder(TYPE, "integer16", INT16NS, MERGE);
+            case INT32NS:
+                return getYdtBuilder(TYPE, "integer32", INT32NS, MERGE);
+            case INT64NS:
+                return getYdtBuilder(TYPE, "integer64", INT64NS, MERGE);
+            case BITNS:
+                return getYdtBuilder(TYPE, "bit", BITNS, MERGE);
+            case BOOLNS:
+                return getYdtBuilder(TYPE, "bool", BOOLNS, MERGE);
+            case EMPTYNS:
+                return getYdtBuilder(TYPE, "emptydata", EMPTYNS, MERGE);
+            case ENUMNS:
+                return getYdtBuilder(TYPE, "enumtest", ENUMNS, MERGE);
+            case LISTNS:
+                return getYdtBuilder(LIST, "rootlist", LISTNS, MERGE);
+            default:
+                return null;
+        }
+    }
+
+    /**
+     * Validates the contents of node like name, namespace and operation type.
+     *
+     * @param ydtNode node need to be validate
+     * @param name    name of the node
+     * @param opType  operation type of the node
+     */
+    public static void validateNodeContents(YdtNode ydtNode, String name,
+                                            YdtContextOperationType opType) {
+        assertEquals(ydtNode.getName(), name);
+        assertEquals(ydtNode.getYdtContextOperationType(), opType);
+    }
+
+    /**
+     * Validates the contents of leaf node like name, namespace and operation
+     * type.
+     *
+     * @param ydtNode node need to be validate
+     * @param name    name of the node
+     * @param value   value of the leaf node
+     */
+    public static void validateLeafContents(YdtNode ydtNode, String name,
+                                            String value) {
+        validateNodeContents(ydtNode, name, null);
+        assertEquals(ydtNode.getValue(), value);
+    }
+
+    /**
+     * Validates the contents of leaf-list node like name, namespace and
+     * operation type.
+     *
+     * @param ydtNode  node need to be validate
+     * @param name     name of the node
+     * @param valueSet value of the leaf node
+     */
+    public static void validateLeafListContents(YdtNode ydtNode, String name,
+                                                Set<String> valueSet) {
+        validateNodeContents(ydtNode, name, null);
+        compareValueSet(ydtNode.getValueSet(), valueSet);
+    }
+
+    /**
+     * Validates the contents of ydt application logical node.
+     *
+     * @param ydtAppNode node need to be validate
+     */
+    public static void validateAppLogicalNodeContents(
+            YdtAppContext ydtAppNode) {
+
+        assertNull(ydtAppNode.getOperationType());
+        assertNull(ydtAppNode.getParent());
+        assertNull(ydtAppNode.getNextSibling());
+        assertNull(ydtAppNode.getPreviousSibling());
+        assertNotNull(ydtAppNode.getFirstChild());
+        assertNotNull(ydtAppNode.getLastChild());
+    }
+
+    /**
+     * Validates the contents of ydt application module node.
+     *
+     * @param ydtAppNode node need to be validate
+     * @param name       name of the node
+     * @param opType     operation type of the app node
+     */
+    public static void validateAppModuleNodeContents(
+            YdtAppContext ydtAppNode, String name,
+            YdtAppNodeOperationType opType) {
+
+        assertEquals(ydtAppNode.getModuleContext().getName(), name);
+        assertEquals(ydtAppNode.getOperationType(), opType);
+    }
+
+    /**
+     * Validates the contents of ydt application node like name, namespace
+     * and operation type.
+     *
+     * @param ydtAppNode node need to be validate
+     * @param name       name of the schema node
+     * @param ns         namespace of the schema node
+     * @param opType     operation type of the app node
+     */
+    public static void validateAppNodeContents(
+            YdtAppContext ydtAppNode, String name, String ns,
+            YdtAppNodeOperationType opType) {
+        assertEquals(ydtAppNode.getAugmentingSchemaNode().getName(), name);
+        assertEquals(ydtAppNode.getAugmentingSchemaNode().getNameSpace(), ns);
+        assertEquals(ydtAppNode.getOperationType(), opType);
+    }
+
+    /**
+     * Walks in the given built ydt and validates it.
+     */
+    public static void walkINTree(YangRequestWorkBench ydtBuilder,
+                                  String[] expected) {
+        DefaultYdtWalker ydtWalker = new DefaultYdtWalker();
+        resetLogger();
+
+        YdtTestUtils utils = new YdtTestUtils();
+        // Assign root node as starting node to walk the whole tree.
+        ydtWalker.walk(utils, ydtBuilder.getRootNode());
+        // Logger list is used for walker testing.
+        List<String> logger = getLogger();
+
+        for (int i = 0; i < expected.length; i++) {
+            assertEquals(expected[i], logger.get(i));
+        }
+    }
+}
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/Hello_ONOS.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/Hello_ONOS.yang
new file mode 100644
index 0000000..d5eafbe
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/Hello_ONOS.yang
@@ -0,0 +1,57 @@
+module Hello_ONOS {
+    yang-version 1;
+    namespace "ydt:hello_onos";
+    prefix "hello";
+
+    revision "2016-09-03" {
+        description "Initial revision of hello model";
+    }
+
+    grouping greeting {
+        leaf name {
+            type string;
+        }
+
+        leaf surName {
+            type string;
+        }
+    }
+
+    rpc hello-world {
+        input {
+
+            // uses greeting;
+
+            leaf name {
+                type string;
+            }
+
+            leaf surName {
+                type string;
+            }
+
+            leaf inputDefault {
+                type string;
+            }
+
+            list stringList {
+                key "string1 string2";
+                unique "string3";
+                leaf string1 {
+                      type string;
+                }
+                leaf string2 {
+                      type string;
+                }
+                leaf string3 {
+                      type string;
+                }
+            }
+        }
+        output {
+            leaf greetingOut {
+                type string;
+            }
+        }
+    }
+}
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/Logistics-manager.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/Logistics-manager.yang
new file mode 100644
index 0000000..3cd4321
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/Logistics-manager.yang
@@ -0,0 +1,66 @@
+module Logistics-manager {
+
+    yang-version 1;
+
+    namespace "ydt.root";
+
+    prefix "root";
+
+    organization "ON-LAB";
+
+    description "This module defines for organisation.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    leaf Customs-supervisor {
+        type string;
+        description "name of the customs-supervisor.";
+    }
+
+    leaf Merchandiser-supervisor {
+        type string;
+        description "name of merchandiser-supervisor";
+    }
+
+    list Material-supervisor {
+        key "name";
+        leaf name {
+            type string;
+            description "name of logistics-supervisor";
+        }
+
+        leaf departmentId {
+            type string;
+            description "name of department";
+        }
+    }
+
+    container Purchasing-supervisor {
+        leaf purchasing-specialist {
+            type string;
+            description "name of the purchasing-specialist person";
+        }
+
+        leaf support {
+            type string;
+            description "name of the support person";
+        }
+    }
+
+    leaf-list Warehouse-supervisor {
+        type string;
+        description "name of the warehouse-supervisor's";
+    }
+
+    leaf trading-supervisor {
+        type string;
+        description "name of the trading-supervisor";
+    }
+
+    leaf-list employee-id {
+        type string;
+        description "list of the employee id";
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology1.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology1.yang
new file mode 100644
index 0000000..6736063
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology1.yang
@@ -0,0 +1,51 @@
+module augment-topology1 {
+
+    yang-version 1;
+
+    namespace "ydt.augment-topology1";
+
+    prefix "aug1";
+
+    import yms-ietf-network {
+        prefix nd;
+    }
+
+    import yms-network-topology {
+        prefix topo;
+    }
+
+    organization "ON-LAB";
+
+    description "This module defines for augment-topology1 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    augment "/nd:networks/nd:network/topo:link" {
+        description
+        "Add augment1 to the link model.";
+        list augment1 {
+            key "value1";
+            leaf value1 {
+                  type int8;
+            }
+        }
+    }
+
+    augment "/nd:networks/nd:network/nd:node/topo:t-point" +
+    "/supporting-termination-point" {
+        description
+        "Add augment1 to the termination-point model.";
+        container augment1 {
+            leaf value1 {
+                  type int8;
+            }
+        }
+
+        leaf augment1-leaf {
+            type string;
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology2.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology2.yang
new file mode 100644
index 0000000..82a19d7
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology2.yang
@@ -0,0 +1,63 @@
+module augment-topology2 {
+
+    yang-version 1;
+
+    namespace "ydt.augment-topology2";
+
+    prefix "aug2";
+
+    import yms-ietf-network {
+        prefix nd;
+    }
+
+    import yms-network-topology {
+        prefix topo;
+    }
+
+    organization "ON-LAB";
+
+    description "This module defines for augment-topology2 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    augment "/nd:networks/nd:network/topo:link" {
+        description
+        "Add augment2 to the link model.";
+        list augment2 {
+            key "key1 key2";
+            leaf key1 {
+                  type int8;
+            }
+            leaf key2 {
+                  type int8;
+            }
+        }
+
+        leaf-list augment2leafList {
+            type string;
+        }
+    }
+
+    augment "/nd:networks/nd:network/nd:node/topo:t-point/" +
+    "supporting-termination-point" {
+        description
+        "Add augment2 to the supporting-termination-point model.";
+        container augment2 {
+            config false;
+            leaf value2 {
+                  type int8;
+            }
+        }
+
+        leaf-list augment2leafList {
+            type string;
+        }
+
+        leaf augment2leaf {
+            type string;
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology3.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology3.yang
new file mode 100644
index 0000000..d2c58ce
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology3.yang
@@ -0,0 +1,59 @@
+module augment-topology3 {
+
+    yang-version 1;
+
+    namespace "ydt.augment-topology3";
+
+    prefix "aug3";
+
+    import yms-ietf-network {
+        prefix nd;
+    }
+
+    import augment-topology1 {
+        prefix aug1;
+    }
+
+    import augment-topology2 {
+        prefix aug2;
+    }
+
+    import yms-network-topology {
+        prefix topo;
+    }
+
+    organization "ON-LAB";
+
+    description "This module defines for augment-topology3 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    augment "/nd:networks/nd:network/topo:link/aug2:augment2" {
+        description
+        "Add augment3 to the augment2 model.";
+        container augment3 {
+            config false;
+            leaf value3 {
+                  type int8;
+            }
+        }
+
+        leaf augment3leaf {
+            type string;
+        }
+    }
+
+    augment "/nd:networks/nd:network/nd:node/topo:t-point/" +
+    "supporting-termination-point/aug2:augment2" {
+        description
+        "Add augment3 to the augment2 model.";
+        container augment3 {
+            config false;
+            leaf value3 {
+                  type int8;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology4.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology4.yang
new file mode 100644
index 0000000..b8cea93
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology4.yang
@@ -0,0 +1,58 @@
+module augment-topology4 {
+
+    yang-version 1;
+
+    namespace "ydt.augment-topology4";
+
+    prefix "aug4";
+
+    import yms-ietf-network {
+        prefix nd;
+    }
+
+    import augment-topology1 {
+        prefix aug1;
+    }
+
+    import augment-topology2 {
+        prefix aug2;
+    }
+
+    import augment-topology3 {
+        prefix aug3;
+    }
+
+    import yms-network-topology {
+        prefix topo;
+    }
+
+    organization "ON-LAB";
+
+    description "This module defines for augment-topology4 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    augment "/nd:networks/nd:network/topo:link/aug2:augment2/aug3:augment3" {
+        description
+        "Add augment4 to the augment3 model.";
+        container augment4 {
+            config false;
+            leaf value4 {
+                  type int8;
+            }
+        }
+    }
+
+    augment "/nd:networks/nd:network/nd:node/topo:t-point/" +
+    "supporting-termination-point/aug2:augment2" {
+        description
+        "Add augment4leaf to the augment2 model.";
+
+        leaf augment4leaf{
+            type string;
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology5.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology5.yang
new file mode 100644
index 0000000..a13a688
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology5.yang
@@ -0,0 +1,66 @@
+module augment-topology5 {
+
+    yang-version 1;
+
+    namespace "ydt.augment-topology5";
+
+    prefix "aug5";
+
+    import yms-ietf-network {
+        prefix nd;
+    }
+
+    import augment-topology1 {
+        prefix aug1;
+    }
+
+    import augment-topology2 {
+        prefix aug2;
+    }
+
+    import augment-topology3 {
+        prefix aug3;
+    }
+
+    import augment-topology4 {
+        prefix aug4;
+    }
+
+    import yms-network-topology {
+        prefix topo;
+    }
+
+    organization "ON-LAB";
+
+    description "This module defines for augment-topology5 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    augment "/nd:networks/nd:network/topo:link/aug2:augment2" {
+        description
+        "Add container to the augment2 model.";
+        container augment5 {
+            config false;
+            leaf value5 {
+                  type int8;
+            }
+        }
+
+        leaf-list augment5leafList {
+            type string;
+        }
+    }
+
+    augment "/nd:networks/nd:network/topo:link/aug2:augment2/aug3:augment3" {
+        description
+        "Add augment5 to the augment3 model.";
+        container augment5 {
+            config false;
+            leaf value5 {
+                  type int8;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology6.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology6.yang
new file mode 100644
index 0000000..15bd3d5
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/augment-topology6.yang
@@ -0,0 +1,73 @@
+module augment-topology6 {
+
+    yang-version 1;
+
+    namespace "ydt.augment-topology6";
+
+    prefix "aug5";
+
+    import yms-ietf-network {
+        prefix nd;
+    }
+
+    import augment-topology1 {
+        prefix aug1;
+    }
+
+    import augment-topology2 {
+        prefix aug2;
+    }
+
+    import augment-topology3 {
+        prefix aug3;
+    }
+
+    import augment-topology4 {
+        prefix aug4;
+    }
+
+    import augment-topology5 {
+        prefix aug5;
+    }
+
+    import yms-network-topology {
+        prefix topo;
+    }
+
+    organization "ON-LAB";
+
+    description "This module defines for augment-topology6 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    augment "/nd:networks/nd:network/topo:link/aug2:augment2/aug3:augment3" {
+        description
+        "Add augment6 to the augment3 model.";
+        container augment6 {
+            config true;
+            leaf value6 {
+                  type int8;
+            }
+        }
+    }
+
+    augment "/nd:networks/nd:network/topo:link/aug2:augment2/aug3:augment3/" +
+    "aug5:augment5" {
+        description
+        "Add leaf6 to the augment5 model.";
+        leaf leaf6 {
+            type string;
+        }
+
+    }
+
+    augment "/nd:networks/nd:network/topo:link/aug2:augment2/aug5:augment5" {
+        description
+        "Add list to the augment5 model.";
+        leaf-list augment6leafList {
+            type string;
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/augmentNetwork.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/augmentNetwork.yang
new file mode 100644
index 0000000..315bc44
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/augmentNetwork.yang
@@ -0,0 +1,33 @@
+module augmentNetwork {
+
+    yang-version 1;
+
+    namespace "ydt.augmentNetwork";
+
+    prefix "aug";
+
+    import yms-ietf-network {
+        prefix nd;
+    }
+
+
+    organization "ON-LAB";
+
+    description "This module defines for augmentNetwork classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    augment "/nd:networks/nd:network" {
+        description
+        "Add container to the network model.";
+        container cont1s {
+            container cont1s {
+                leaf fine {
+                    type string;
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/binarytest.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/binarytest.yang
new file mode 100644
index 0000000..71ada48
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/binarytest.yang
@@ -0,0 +1,33 @@
+module binarytest {
+
+    yang-version 1;
+
+    namespace "ydt.binarytest";
+
+    prefix "binarytest";
+
+    organization "ON-LAB";
+
+    description "This module defines for binarytest classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    list binaryList {
+        config false;
+        leaf binary {
+              type binary;
+        }
+        leaf binaryWithRange {
+              type binary {
+                   length "2 .. 10";
+              }
+        }
+        leaf binaryWithMultiRange {
+              type binary {
+                   length "min..10 | 20 | 30..max";
+              }
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/bit.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/bit.yang
new file mode 100644
index 0000000..6d97ccc
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/bit.yang
@@ -0,0 +1,51 @@
+module bit {
+
+    yang-version 1;
+
+    namespace "ydt.bit";
+
+    prefix "bit";
+
+    organization "ON-LAB";
+
+    description "This module defines for bit classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+/*
+     leaf mybits {
+         type bits {
+             bit disable-nagle {
+                 position 0;
+             }
+             bit auto-sense-speed {
+                 position 1;
+             }
+             bit 10-Mb-only {
+                 position 2;
+             }
+         }
+         default "auto-sense-speed";
+     }
+     */
+
+    list bitList {
+        config false;
+        leaf bit {
+            type bits {
+                bit disable-nagle {
+                position 0;
+                }
+                bit auto-sense-speed {
+                position 1;
+                }
+                bit ten-Mb-only {
+                position 2;
+                }
+            }
+            default "auto-sense-speed";
+
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/bool.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/bool.yang
new file mode 100644
index 0000000..1bb6181
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/bool.yang
@@ -0,0 +1,23 @@
+module bool {
+
+    yang-version 1;
+
+    namespace "ydt.boolean";
+
+    prefix "bool";
+
+    organization "ON-LAB";
+
+    description "This module defines for bool classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    list booleanList {
+        key boolean;
+        leaf boolean {
+              type boolean;
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/customssupervisor.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/customssupervisor.yang
new file mode 100644
index 0000000..73aa806
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/customssupervisor.yang
@@ -0,0 +1,21 @@
+module customssupervisor {
+
+    yang-version 1;
+
+    namespace "ydt.customs-supervisor";
+
+    prefix "customs";
+
+    organization "ON-LAB";
+
+    description "This module defines for customs-supervisor.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    leaf supervisor {
+        type string;
+        description "name of the customs-supervisor.";
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/decimal64.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/decimal64.yang
new file mode 100644
index 0000000..6470e8a
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/decimal64.yang
@@ -0,0 +1,90 @@
+module decimal64 {
+
+    yang-version 1;
+
+    namespace "ydt.decimal64";
+
+    prefix "decimal64";
+
+    organization "ON-LAB";
+
+    description "This module defines for decimal64 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+    leaf negInt {
+          type decimal64 {
+                fraction-digits 2;
+          }
+    }
+
+    leaf negIntWithMaxFraction {
+          type decimal64 {
+                fraction-digits 18;
+          }
+    }
+
+    leaf negIntWithMinFraction {
+          type decimal64 {
+                fraction-digits 1;
+          }
+    }
+
+    leaf posInt {
+          type decimal64 {
+                fraction-digits 2;
+          }
+    }
+
+    leaf posIntWithMaxFraction {
+          type decimal64 {
+                fraction-digits 18;
+          }
+
+    }
+
+    leaf posIntWithMinFraction {
+          type decimal64 {
+                fraction-digits 1;
+          }
+
+    }
+
+    leaf minIntWithRange {
+          type decimal64 {
+                fraction-digits 2;
+                range "10 .. 100";
+          }
+    }
+
+    leaf midIntWithRange {
+          type decimal64 {
+             fraction-digits 2;
+             range "10 .. 100";
+         }
+    }
+
+    leaf maxIntWithRange {
+          type decimal64 {
+             fraction-digits 2;
+             range "10 .. 100";
+         }
+    }
+
+    list multiRangeValidation {
+        config false;
+        leaf decimal {
+              type decimal64 {
+                 fraction-digits 2;
+                 range "10..40 | 50..100";
+              }
+        }
+        leaf revDecimal {
+              type decimal64 {
+                 fraction-digits 2;
+                 range "min .. 3.14 | 10 | 20..max";
+              }
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/employeeid.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/employeeid.yang
new file mode 100644
index 0000000..be27c70
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/employeeid.yang
@@ -0,0 +1,21 @@
+module employeeid {
+
+    yang-version 1;
+
+    namespace "ydt.employee-id";
+
+    prefix "id";
+
+    organization "ON-LAB";
+
+    description "This module defines for employee-id.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    leaf-list employeeid {
+        type string;
+        description "list of the employee id";
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/emptydata.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/emptydata.yang
new file mode 100644
index 0000000..33f58b3
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/emptydata.yang
@@ -0,0 +1,23 @@
+module emptydata {
+
+    yang-version 1;
+
+    namespace "ydt.emptydata";
+
+    prefix "emptydata";
+
+    organization "ON-LAB";
+
+    description "This module defines for emptydata classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    list emptyList {
+        config false;
+        leaf empty {
+              type empty;
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/enumtest.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/enumtest.yang
new file mode 100644
index 0000000..a9255c5
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/enumtest.yang
@@ -0,0 +1,27 @@
+module enumtest {
+
+    yang-version 1;
+
+    namespace "ydt.enumtest";
+
+    prefix "enumtest";
+
+    organization "ON-LAB";
+
+    description "This module defines for enumtest classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    list enumList {
+        key enumleaf;
+        leaf enumleaf {
+            type enumeration {
+              enum ten { value "10";}
+              enum hundred { value "100";}
+              enum thousand { value "1000"; }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/food.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/food.yang
new file mode 100644
index 0000000..202d11f
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/food.yang
@@ -0,0 +1,39 @@
+module food {
+
+    yang-version 1;
+
+    namespace "ydt.food";
+
+    prefix "foodType";
+
+    organization "ON-LAB";
+
+    description "This module defines for food.";
+
+    revision "2016-06-24" {
+        description "Initial revision.";
+    }
+
+    container food {
+       choice snack {
+           case sportsarena {
+
+               leaf pretzel {
+                   type empty;
+               }
+               leaf beer {
+                   type empty;
+               }
+           }
+           case latenight {
+               leaf chocolate {
+                   type enumeration {
+                       enum dark;
+                       enum milk;
+                       enum first-available;
+                   }
+               }
+           }
+       }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/ietf-inet-types.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/ietf-inet-types.yang
new file mode 100644
index 0000000..6b994bb
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/ietf-inet-types.yang
@@ -0,0 +1,454 @@
+  module yms-ietf-inet-types {
+
+    yang-version 1;
+
+    namespace
+      "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+
+    prefix inet;
+
+    organization
+      "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+
+    contact
+      "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+
+    description
+      "This module contains a collection of generally useful derived
+    YANG data types for Internet addresses and related things.
+
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+
+    revision "2013-07-15" {
+      description
+        "This revision adds the following new data types:
+      - ip-address-no-zone
+      - ipv4-address-no-zone
+      - ipv6-address-no-zone";
+      reference
+        "RFC 6991: Common YANG Data Types";
+
+    }
+
+    revision "2010-09-24" {
+      description "Initial revision.";
+      reference
+        "RFC 6021: Common YANG Data Types";
+
+    }
+
+
+    typedef ip-version {
+      type enumeration {
+        enum "unknown" {
+          value 0;
+          description
+            "An unknown or unspecified version of the Internet
+          protocol.";
+        }
+        enum "ipv4" {
+          value 1;
+          description
+            "The IPv4 protocol as defined in RFC 791.";
+        }
+        enum "ipv6" {
+          value 2;
+          description
+            "The IPv6 protocol as defined in RFC 2460.";
+        }
+      }
+      description
+        "This value represents the version of the IP protocol.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetVersion textual convention of the SMIv2.";
+      reference
+        "RFC  791: Internet Protocol
+         RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
+         RFC 4001: Textual Conventions for Internet Network Addresses";
+
+    }
+
+    typedef dscp {
+      type uint8 {
+        range "0..63";
+      }
+      description
+        "The dscp type represents a Differentiated Services Code Point
+      that may be used for marking packets in a traffic stream.
+      In the value set and its semantics, this type is equivalent
+      to the Dscp textual convention of the SMIv2.";
+      reference
+        "RFC 3289: Management Information Base for the Differentiated
+        	  Services Architecture
+         RFC 2474: Definition of the Differentiated Services Field
+        	  (DS Field) in the IPv4 and IPv6 Headers
+         RFC 2780: IANA Allocation Guidelines For Values In
+        	  the Internet Protocol and Related Headers";
+
+    }
+
+    typedef ipv6-flow-label {
+      type uint32 {
+        range "0..1048575";
+      }
+      description
+        "The ipv6-flow-label type represents the flow identifier or Flow
+      Label in an IPv6 packet header that may be used to
+      discriminate traffic flows.
+
+      In the value set and its semantics, this type is equivalent
+      to the IPv6FlowLabel textual convention of the SMIv2.";
+      reference
+        "RFC 3595: Textual Conventions for IPv6 Flow Label
+         RFC 2460: Internet Protocol, Version 6 (IPv6) Specification";
+
+    }
+
+    typedef port-number {
+      type uint16 {
+        range "0..65535";
+      }
+      description
+        "The port-number type represents a 16-bit port number of an
+      Internet transport-layer protocol such as UDP, TCP, DCCP, or
+      SCTP.  Port numbers are assigned by IANA.  A current list of
+      all assignments is available from <http://www.iana.org/>.
+
+      Note that the port number value zero is reserved by IANA.  In
+      situations where the value zero does not make sense, it can
+      be excluded by subtyping the port-number type.
+      In the value set and its semantics, this type is equivalent
+      to the InetPortNumber textual convention of the SMIv2.";
+      reference
+        "RFC  768: User Datagram Protocol
+         RFC  793: Transmission Control Protocol
+         RFC 4960: Stream Control Transmission Protocol
+         RFC 4340: Datagram Congestion Control Protocol (DCCP)
+         RFC 4001: Textual Conventions for Internet Network Addresses";
+
+    }
+
+    typedef as-number {
+      type uint32;
+      description
+        "The as-number type represents autonomous system numbers
+      which identify an Autonomous System (AS).  An AS is a set
+      of routers under a single technical administration, using
+      an interior gateway protocol and common metrics to route
+      packets within the AS, and using an exterior gateway
+      protocol to route packets to other ASes.  IANA maintains
+      the AS number space and has delegated large parts to the
+      regional registries.
+
+      Autonomous system numbers were originally limited to 16
+      bits.  BGP extensions have enlarged the autonomous system
+      number space to 32 bits.  This type therefore uses an uint32
+      base type without a range restriction in order to support
+      a larger autonomous system number space.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetAutonomousSystemNumber textual convention of
+      the SMIv2.";
+      reference
+        "RFC 1930: Guidelines for creation, selection, and registration
+        	  of an Autonomous System (AS)
+         RFC 4271: A Border Gateway Protocol 4 (BGP-4)
+         RFC 4001: Textual Conventions for Internet Network Addresses
+         RFC 6793: BGP Support for Four-Octet Autonomous System (AS)
+        	  Number Space";
+
+    }
+
+    typedef ip-address {
+      type union {
+        type ipv4-address;
+        type ipv6-address;
+      }
+      description
+        "The ip-address type represents an IP address and is IP
+      version neutral.  The format of the textual representation
+      implies the IP version.  This type supports scoped addresses
+      by allowing zone identifiers in the address format.";
+      reference
+        "RFC 4007: IPv6 Scoped Address Architecture";
+
+    }
+
+    typedef ipv4-address {
+      type string {
+        pattern
+          '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(%[\p{N}\p{L}]+)?';
+      }
+      description
+        "The ipv4-address type represents an IPv4 address in
+       dotted-quad notation.  The IPv4 address may include a zone
+       index, separated by a % sign.
+
+       The zone index is used to disambiguate identical address
+       values.  For link-local addresses, the zone index will
+       typically be the interface index number or the name of an
+       interface.  If the zone index is not present, the default
+       zone of the device will be used.
+
+       The canonical format for the zone index is the numerical
+       format";
+    }
+
+    typedef ipv6-address {
+      type string {
+        pattern
+          '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))(%[\p{N}\p{L}]+)?';
+        pattern
+          '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)(%.+)?';
+      }
+      description
+        "The ipv6-address type represents an IPv6 address in full,
+      mixed, shortened, and shortened-mixed notation.  The IPv6
+      address may include a zone index, separated by a % sign.
+
+      The zone index is used to disambiguate identical address
+      values.  For link-local addresses, the zone index will
+      typically be the interface index number or the name of an
+      interface.  If the zone index is not present, the default
+      zone of the device will be used.
+
+
+
+      The canonical format of IPv6 addresses uses the textual
+      representation defined in Section 4 of RFC 5952.  The
+      canonical format for the zone index is the numerical
+      format as described in Section 11.2 of RFC 4007.";
+      reference
+        "RFC 4291: IP Version 6 Addressing Architecture
+         RFC 4007: IPv6 Scoped Address Architecture
+         RFC 5952: A Recommendation for IPv6 Address Text
+        	  Representation";
+
+    }
+
+    typedef ip-address-no-zone {
+      type union {
+        type ipv4-address-no-zone;
+        type ipv6-address-no-zone;
+      }
+      description
+        "The ip-address-no-zone type represents an IP address and is
+      IP version neutral.  The format of the textual representation
+      implies the IP version.  This type does not support scoped
+      addresses since it does not allow zone identifiers in the
+      address format.";
+      reference
+        "RFC 4007: IPv6 Scoped Address Architecture";
+
+    }
+
+    typedef ipv4-address-no-zone {
+      type ipv4-address {
+        pattern '[0-9\.]*';
+      }
+      description
+        "An IPv4 address without a zone index.  This type, derived from
+       ipv4-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+    }
+
+    typedef ipv6-address-no-zone {
+      type ipv6-address {
+        pattern '[0-9a-fA-F:\.]*';
+      }
+      description
+        "An IPv6 address without a zone index.  This type, derived from
+       ipv6-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+      reference
+        "RFC 4291: IP Version 6 Addressing Architecture
+         RFC 4007: IPv6 Scoped Address Architecture
+         RFC 5952: A Recommendation for IPv6 Address Text
+        	  Representation";
+
+    }
+
+    typedef ip-prefix {
+      type union {
+        type ipv4-prefix;
+        type ipv6-prefix;
+      }
+      description
+        "The ip-prefix type represents an IP prefix and is IP
+      version neutral.  The format of the textual representations
+      implies the IP version.";
+    }
+
+    typedef ipv4-prefix {
+      type string {
+        pattern
+          '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])/(([0-9])|([1-2][0-9])|(3[0-2]))';
+      }
+      description
+        "The ipv4-prefix type represents an IPv4 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 32.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The canonical format of an IPv4 prefix has all bits of
+      the IPv4 address set to zero that are not part of the
+      IPv4 prefix.";
+    }
+
+    typedef ipv6-prefix {
+      type string {
+        pattern
+          '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))(/(([0-9])|([0-9]{2})|(1[0-1][0-9])|(12[0-8])))';
+        pattern
+          '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)(/.+)';
+      }
+      description
+        "The ipv6-prefix type represents an IPv6 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 128.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The IPv6 address should have all bits that do not belong
+      to the prefix set to zero.
+
+      The canonical format of an IPv6 prefix has all bits of
+      the IPv6 address set to zero that are not part of the
+      IPv6 prefix.  Furthermore, the IPv6 address is represented
+      as defined in Section 4 of RFC 5952.";
+      reference
+        "RFC 5952: A Recommendation for IPv6 Address Text
+        	  Representation";
+
+    }
+
+    typedef domain-name {
+      type string {
+        length "1..253";
+        pattern
+          '((([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.)*([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.?)|\.';
+      }
+      description
+        "The domain-name type represents a DNS domain name.  The
+      name SHOULD be fully qualified whenever possible.
+
+      Internet domain names are only loosely specified.  Section
+      3.5 of RFC 1034 recommends a syntax (modified in Section
+      2.1 of RFC 1123).  The pattern above is intended to allow
+      for current practice in domain name use, and some possible
+      future expansion.  It is designed to hold various types of
+      domain names, including names used for A or AAAA records
+      (host names) and other records, such as SRV records.  Note
+      that Internet host names have a stricter syntax (described
+      in RFC 952) than the DNS recommendations in RFCs 1034 and
+      1123, and that systems that want to store host names in
+      schema nodes using the domain-name type are recommended to
+      adhere to this stricter standard to ensure interoperability.
+
+      The encoding of DNS names in the DNS protocol is limited
+      to 255 characters.  Since the encoding consists of labels
+      prefixed by a length bytes and there is a trailing NULL
+      byte, only 253 characters can appear in the textual dotted
+      notation.
+
+      The description clause of schema nodes using the domain-name
+      type MUST describe when and how these names are resolved to
+      IP addresses.  Note that the resolution of a domain-name value
+      may require to query multiple DNS records (e.g., A for IPv4
+      and AAAA for IPv6).  The order of the resolution process and
+      which DNS record takes precedence can either be defined
+      explicitly or may depend on the configuration of the
+      resolver.
+
+      Domain-name values use the US-ASCII encoding.  Their canonical
+      format uses lowercase US-ASCII characters.  Internationalized
+      domain names MUST be A-labels as per RFC 5890.";
+      reference
+        "RFC  952: DoD Internet Host Table Specification
+         RFC 1034: Domain Names - Concepts and Facilities
+         RFC 1123: Requirements for Internet Hosts -- Application
+        	  and Support
+         RFC 2782: A DNS RR for specifying the location of services
+        	  (DNS SRV)
+         RFC 5890: Internationalized Domain Names in Applications
+        	  (IDNA): Definitions and Document Framework";
+
+    }
+
+    typedef host {
+      type union {
+        type ip-address;
+        type domain-name;
+      }
+      description
+        "The host type represents either an IP address or a DNS
+      domain name.";
+    }
+
+    typedef uri {
+      type string;
+      description
+        "The uri type represents a Uniform Resource Identifier
+      (URI) as defined by STD 66.
+
+      Objects using the uri type MUST be in US-ASCII encoding,
+      and MUST be normalized as described by RFC 3986 Sections
+      6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
+      percent-encoding is removed, and all case-insensitive
+      characters are set to lowercase except for hexadecimal
+      digits, which are normalized to uppercase as described in
+      Section 6.2.2.1.
+
+      The purpose of this normalization is to help provide
+      unique URIs.  Note that this normalization is not
+      sufficient to provide uniqueness.  Two URIs that are
+      textually distinct after this normalization may still be
+      equivalent.
+
+      Objects using the uri type may restrict the schemes that
+      they permit.  For example, 'data:' and 'urn:' schemes
+      might not be appropriate.
+
+      A zero-length URI is not a valid URI.  This can be used to
+      express 'URI absent' where required.
+
+      In the value set and its semantics, this type is equivalent
+      to the Uri SMIv2 textual convention defined in RFC 5017.";
+      reference
+        "RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
+         RFC 3305: Report from the Joint W3C/IETF URI Planning Interest
+        	  Group: Uniform Resource Identifiers (URIs), URLs,
+        	  and Uniform Resource Names (URNs): Clarifications
+        	  and Recommendations
+         RFC 5017: MIB Textual Conventions for Uniform Resource
+        	  Identifiers (URIs)";
+
+    }
+  }  // module ietf-inet-types
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/ietf-network.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/ietf-network.yang
new file mode 100644
index 0000000..b56f6cf
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/ietf-network.yang
@@ -0,0 +1,216 @@
+   module yms-ietf-network {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-network";
+     prefix nd;
+
+     import yms-ietf-inet-types {
+       prefix inet;
+     }
+
+     organization
+       "IETF I2RS (Interface to the Routing System) Working Group";
+
+     contact
+       "WG Web:    <http://tools.ietf.org/wg/i2rs/>
+        WG List:   <mailto:i2rs@ietf.org>
+
+        WG Chair:  Susan Hares
+                   <mailto:shares@ndzh.com>
+
+        WG Chair:  Jeffrey Haas
+                   <mailto:jhaas@pfrc.org>
+
+        Editor:    Alexander Clemm
+                   <mailto:alex@cisco.com>
+
+        Editor:    Jan Medved
+                   <mailto:jmedved@cisco.com>
+
+        Editor:    Robert Varga
+                   <mailto:rovarga@cisco.com>
+
+        Editor:    Tony Tkacik
+                   <mailto:ttkacik@cisco.com>
+
+        Editor:    Nitin Bahadur
+                   <mailto:nitin_bahadur@yahoo.com>
+
+        Editor:    Hariharan Ananthakrishnan
+                   <mailto:hari@packetdesign.com>";
+
+     description
+       "This module defines a common base model for a collection
+        of nodes in a network. Node definitions are further used
+        in network topologies and inventories.
+
+        Copyright (c) 2015 IETF Trust and the persons identified as
+        authors of the code.  All rights reserved.
+
+        Redistribution and use in source and binary forms, with or
+        without modification, is permitted pursuant to, and subject
+        to the license terms contained in, the Simplified BSD License
+        set forth in Section 4.c of the IETF Trust's Legal Provisions
+        Relating to IETF Documents
+        (http://trustee.ietf.org/license-info).
+
+        This version of this YANG module is part of
+        draft-ietf-i2rs-yang-network-topo-02;
+        see the RFC itself for full legal notices.
+
+        NOTE TO RFC EDITOR: Please replace above reference to
+        draft-ietf-i2rs-yang-network-topo-02 with RFC
+        number when published (i.e. RFC xxxx).";
+
+     revision 2015-12-08 {
+       description
+         "Initial revision.
+          NOTE TO RFC EDITOR: Please replace the following reference
+          to draft-ietf-i2rs-yang-network-topo-02 with
+          RFC number when published (i.e. RFC xxxx).";
+       reference
+         "draft-ietf-i2rs-yang-network-topo-02";
+     }
+
+     typedef node-id {
+       type inet:uri;
+       description
+         "Identifier for a node.";
+     }
+
+     typedef network-id {
+       type inet:uri;
+       description
+         "Identifier for a network.";
+     }
+     grouping network-ref {
+       description
+         "Contains the information necessary to reference a network,
+          for example an underlay network.";
+       leaf network-ref {
+         type leafref {
+           path "/nd:networks/nd:network/nd:network-id";
+         require-instance false;
+         }
+         description
+           "Used to reference a network, for example an underlay
+            network.";
+       }
+     }
+
+     grouping node-ref {
+       description
+         "Contains the information necessary to reference a node.";
+       leaf node-ref {
+         type leafref {
+           path "/nd:networks/nd:network[nd:network-id=current()/../"+
+             "network-ref]/nd:node/nd:node-id";
+           require-instance false;
+         }
+         description
+           "Used to reference a node.
+            Nodes are identified relative to the network they are
+            contained in.";
+       }
+       uses network-ref;
+     }
+
+     container networks {
+       description
+         "Serves as top-level container for a list of networks.";
+       list network {
+         key "network-id";
+         description
+           "Describes a network.
+            A network typically contains an inventory of nodes,
+            topological information (augmented through
+            network-topology model), as well as layering
+            information.";
+         container network-types {
+           description
+             "Serves as an augmentation target.
+              The network type is indicated through corresponding
+              presence containers augmented into this container.";
+         }
+         leaf network-id {
+           type inet:uri;
+           description
+             "Identifies a network.";
+         }
+         list supporting-network {
+           key "network-ref";
+           description
+             "An underlay network, used to represent layered network
+              topologies.";
+           leaf network-ref {
+             type leafref {
+               path "/networks/network/network-id";
+             require-instance false;
+             }
+             description
+               "References the underlay network.";
+           }
+         }
+         list node {
+           key "node-id";
+           description
+             "The inventory of nodes of this network.";
+           leaf node-id {
+             type node-id;
+             description
+               "Identifies a node uniquely within the containing
+                network.";
+           }
+           list supporting-node {
+             key "network-ref node-ref";
+             description
+               "Represents another node, in an underlay network, that
+                this node is supported by.  Used to represent layering
+                structure.";
+             leaf network-ref {
+               type leafref {
+                 path "../../../supporting-network/network-ref";
+               require-instance false;
+               }
+               description
+                 "References the underlay network that the
+                  underlay node is part of.";
+             }
+             leaf node-ref {
+               type leafref {
+                 path "/networks/network/node/node-id";
+               require-instance false;
+               }
+               description
+                 "References the underlay node itself.";
+             }
+           }
+         }
+       }
+     }
+     container networks-state {
+       config false;
+       description
+         "Serves as top-level container for a list of state information
+          for networks";
+       list network {
+         key "network-ref";
+         description
+           "Data nodes representing operational data and state of
+            networks.
+            An instance is automatically created for every network
+            in the corresponding list under the networks container.";
+         uses network-ref;
+         leaf server-provided {
+           type boolean;
+           description
+             "Indicates whether the information concerning this
+              particular network is populated by the server
+              (server-provided true, the general case for network
+              information discovered from the server),
+              or whether it is configured by a client
+              (server-provided true, possible e.g. for
+              service overlays managed through a controller).";
+         }
+       }
+     }
+   }
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/integer16.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/integer16.yang
new file mode 100644
index 0000000..8db77be
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/integer16.yang
@@ -0,0 +1,98 @@
+module integer16 {
+
+    yang-version 1;
+
+    namespace "ydt.integer16";
+
+    prefix "integer16";
+
+    organization "ON-LAB";
+
+    description "This module defines for integer16 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    list multiRangeValidation {
+        config false;
+        leaf integer {
+              type int16 {
+                 range "10..40 | 50..100";
+              }
+        }
+        leaf UnInteger {
+              type uint16 {
+                 range "10..40 | 50..100";
+              }
+        }
+
+        leaf revInteger {
+              type int16 {
+                 range "min .. 2 | 10 | 20..max";
+              }
+        }
+
+        leaf revUnInteger {
+              type uint16 {
+                 range "min .. 2 | 10 | 20..max";
+              }
+        }
+    }
+
+    leaf negInt {
+          type int16 {
+         }
+    }
+
+    leaf posInt {
+          type int16 {
+         }
+    }
+
+    leaf minIntWithRange {
+          type int16 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf midIntWithRange {
+          type int16 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf maxIntWithRange {
+          type int16 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf minUInt {
+          type uint16 {
+         }
+    }
+
+    leaf maxUInt {
+          type uint16 {
+         }
+    }
+
+    leaf minUIntWithRange {
+          type uint16 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf midUIntWithRange {
+          type uint16 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf maxUIntWithRange {
+          type uint16 {
+             range "10 .. 100";
+         }
+    }
+}
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/integer32.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/integer32.yang
new file mode 100644
index 0000000..fb596cf
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/integer32.yang
@@ -0,0 +1,98 @@
+module integer32 {
+
+    yang-version 1;
+
+    namespace "ydt.integer32";
+
+    prefix "integer32";
+
+    organization "ON-LAB";
+
+    description "This module defines for integer32 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    list multiRangeValidation {
+        config false;
+        leaf integer {
+              type int32 {
+                 range "10..40 | 50..100";
+              }
+        }
+        leaf UnInteger {
+              type uint32 {
+                 range "10..40 | 50..100";
+              }
+        }
+
+        leaf revInteger {
+              type int32 {
+                 range "min .. 2 | 10 | 20..max";
+              }
+        }
+
+        leaf revUnInteger {
+              type uint32 {
+                 range "min .. 2 | 10 | 20..max";
+              }
+        }
+    }
+
+    leaf negInt {
+          type int32 {
+         }
+    }
+
+    leaf posInt {
+          type int32 {
+         }
+    }
+
+    leaf minIntWithRange {
+          type int32 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf midIntWithRange {
+          type int32 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf maxIntWithRange {
+          type int32 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf minUInt {
+          type uint32 {
+         }
+    }
+
+    leaf maxUInt {
+          type uint32 {
+         }
+    }
+
+    leaf minUIntWithRange {
+          type uint32 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf midUIntWithRange {
+          type uint32 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf maxUIntWithRange {
+          type uint32 {
+             range "10 .. 100";
+         }
+    }
+}
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/integer64.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/integer64.yang
new file mode 100644
index 0000000..39479c6
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/integer64.yang
@@ -0,0 +1,98 @@
+module integer64 {
+
+    yang-version 1;
+
+    namespace "ydt.integer64";
+
+    prefix "integer64";
+
+    organization "ON-LAB";
+
+    description "This module defines for integer64 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    list multiRangeValidation {
+        config false;
+        leaf integer {
+              type int64 {
+                 range "10..40 | 50..100";
+              }
+        }
+        leaf UnInteger {
+              type uint64 {
+                 range "10..40 | 50..100";
+              }
+        }
+
+        leaf revInteger {
+              type int64 {
+                 range "min .. 2 | 10 | 20..max";
+              }
+        }
+
+        leaf revUnInteger {
+              type uint64 {
+                 range "min .. 2 | 10 | 20..max";
+              }
+        }
+    }
+
+    leaf negInt {
+          type int64 {
+         }
+    }
+
+    leaf posInt {
+          type int64 {
+         }
+    }
+
+    leaf minIntWithRange {
+          type int64 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf midIntWithRange {
+          type int64 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf maxIntWithRange {
+          type int64 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf minUInt {
+          type uint64 {
+         }
+    }
+
+    leaf maxUInt {
+          type uint64 {
+         }
+    }
+
+    leaf minUIntWithRange {
+          type uint64 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf midUIntWithRange {
+          type uint64 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf maxUIntWithRange {
+          type uint64 {
+             range "10 .. 100";
+         }
+    }
+}
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/integer8.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/integer8.yang
new file mode 100644
index 0000000..e05c235
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/integer8.yang
@@ -0,0 +1,99 @@
+module integer8 {
+
+    yang-version 1;
+
+    namespace "ydt.integer8";
+
+    prefix "integer8";
+
+    organization "ON-LAB";
+
+    description "This module defines for integer8 classifier.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    list multiRangeValidation {
+        config false;
+        leaf integer {
+              type int8 {
+                 range "10..40 | 50..100";
+              }
+        }
+        leaf UnInteger {
+              type uint8 {
+                 range "10..40 | 50..100";
+              }
+        }
+
+        leaf revInteger {
+              type int8 {
+                 range "min .. 2 | 10 | 20..max";
+              }
+        }
+
+        leaf revUnInteger {
+              type uint8 {
+                 range "min .. 2 | 10 | 20..max";
+              }
+        }
+    }
+
+
+    leaf negInt {
+          type int8 {
+         }
+    }
+
+    leaf posInt {
+          type int8 {
+         }
+    }
+
+    leaf minIntWithRange {
+          type int8 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf midIntWithRange {
+          type int8 {
+             range "10 .. 100";
+          }
+    }
+
+    leaf maxIntWithRange {
+         type int8 {
+             range "10 .. 100";
+         }
+    }
+
+    leaf minUInt {
+         type uint8 {
+         }
+    }
+
+    leaf maxUInt {
+         type uint8 {
+         }
+    }
+
+    leaf minUIntWithRange {
+          type uint8 {
+             range "10 .. 100";
+          }
+    }
+
+    leaf midUIntWithRange {
+          type uint8 {
+             range "10 .. 100";
+          }
+    }
+
+    leaf maxUIntWithRange {
+          type uint8 {
+             range "10 .. 100";
+          }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/logisticsmanager.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/logisticsmanager.yang
new file mode 100644
index 0000000..7198611
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/logisticsmanager.yang
@@ -0,0 +1,16 @@
+module logisticsmanager {
+
+    yang-version 1;
+
+    namespace "ydt.logistics-manager";
+
+    prefix "root";
+
+    organization "ON-LAB";
+
+    description "This module defines for logistics-manager.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/materialsupervisor.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/materialsupervisor.yang
new file mode 100644
index 0000000..6ab16ea
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/materialsupervisor.yang
@@ -0,0 +1,29 @@
+module materialsupervisor {
+
+    yang-version 1;
+
+    namespace "ydt.material-supervisor";
+
+    prefix "material";
+
+    organization "ON-LAB";
+
+    description "This module defines for material-supervisor.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    list supervisor {
+        key "name";
+        leaf name {
+            type string;
+            description "name of material-supervisor";
+        }
+
+        leaf departmentId {
+            type string;
+            description "name of department";
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/merchandisersupervisor.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/merchandisersupervisor.yang
new file mode 100644
index 0000000..db40c7e
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/merchandisersupervisor.yang
@@ -0,0 +1,21 @@
+module merchandisersupervisor {
+
+    yang-version 1;
+
+    namespace "ydt.Merchandiser-supervisor";
+
+    prefix "merchandiser";
+
+    organization "ON-LAB";
+
+    description "This module defines for Merchandiser-supervisor.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    leaf supervisor {
+        type string;
+        description "name of the Merchandiser-supervisor.";
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/purchasingsupervisor.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/purchasingsupervisor.yang
new file mode 100644
index 0000000..a52b4c5
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/purchasingsupervisor.yang
@@ -0,0 +1,27 @@
+module purchasingsupervisor {
+
+    yang-version 1;
+
+    namespace "ydt.purchasing-supervisor";
+
+    prefix "purchasing";
+
+    organization "ON-LAB";
+
+    description "This module defines for purchasing-supervisor.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    container supervisor {
+        leaf purchasing-specialist {
+            type string;
+            description "name of the purchasing-specialist person";
+        }
+        leaf support {
+            type string;
+            description "name of the support person";
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/rootlist.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/rootlist.yang
new file mode 100644
index 0000000..ef5a0a0
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/rootlist.yang
@@ -0,0 +1,111 @@
+module rootlist {
+
+    yang-version 1;
+
+    namespace "ydt.rootlist";
+
+    prefix "rootlist";
+
+    organization "ON-LAB";
+
+    description "This submodule defines for root.";
+
+    revision "2016-06-24" {
+        description "Initial revision.";
+    }
+/*
+                 +--------------+---------+-------------+
+                 | substatement | section | cardinality |
+                 +--------------+---------+-------------+
+                 | anyxml       | 7.10    | 0..n        |
+                 | choice       | 7.9     | 0..n        |
+                 | config       | 7.19.1  | 0..1        |
+                 | container    | 7.5     | 0..n        |
+                 | description  | 7.19.3  | 0..1        |
+                 | grouping     | 7.11    | 0..n        |
+                 | if-feature   | 7.18.2  | 0..n        |
+                 | key          | 7.8.2   | 0..1        |
+                 | leaf         | 7.6     | 0..n        |
+                 | leaf-list    | 7.7     | 0..n        |
+                 | list         | 7.8     | 0..n        |
+                 | max-elements | 7.7.4   | 0..1        |
+                 | min-elements | 7.7.3   | 0..1        |
+                 | must         | 7.5.3   | 0..n        |
+                 | ordered-by   | 7.7.5   | 0..1        |
+                 | reference    | 7.19.4  | 0..1        |
+                 | status       | 7.19.2  | 0..1        |
+                 | typedef      | 7.3     | 0..n        |
+                 | unique       | 7.8.3   | 0..n        |
+                 | uses         | 7.12    | 0..n        |
+                 | when         | 7.19.5  | 0..1        |
+                 +--------------+---------+-------------+
+*/
+
+    list listwithoutcontainer {
+        key "invalidinterval";
+        min-elements 1;  //-- comment
+        leaf invalidinterval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+
+     list listwithcontainer {
+            key "invalid invalid1";
+            max-elements 3;
+            min-elements 1;
+            reference "list reference";
+            unique "invalid";
+            leaf-list invalidinterval {
+                type "uint16";
+                units "seconds";
+                description "Interval before a route is declared invalid";
+                config false;
+                status current;
+                reference "RFC 6020";
+            }
+
+            container interface {
+                leaf invalidinterval {
+                    type "uint16";
+                    units "seconds";
+                    status current;
+                    mandatory true;
+                    reference "RFC 6020";
+                }
+
+                leaf invalid {
+                    type "uint16";
+                    units "seconds";
+                    description "Interval before a route is declared invalid";
+                    default "16";
+                    status current;
+                    reference "RFC 6020";
+                }
+
+            }
+
+            leaf invalid {
+                type "uint16";
+                units "seconds";
+                description "Interval before a route is declared invalid";
+                mandatory true;
+                status current;
+                reference "RFC 6020";
+            }
+
+            leaf invalid1 {
+                type "uint16";
+                units "seconds";
+                description "Interval before a route is declared invalid";
+                mandatory true;
+                status current;
+                reference "RFC 6020";
+            }
+     }
+}
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/tradingsupervisor.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/tradingsupervisor.yang
new file mode 100644
index 0000000..a6c8681
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/tradingsupervisor.yang
@@ -0,0 +1,21 @@
+module tradingsupervisor {
+
+    yang-version 1;
+
+    namespace "ydt.trading-supervisor";
+
+    prefix "trading";
+
+    organization "ON-LAB";
+
+    description "This module defines for trading-supervisor.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    leaf supervisor {
+        type string;
+        description "name of the trading-supervisor";
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/warehousesupervisor.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/warehousesupervisor.yang
new file mode 100644
index 0000000..5145824
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/warehousesupervisor.yang
@@ -0,0 +1,21 @@
+module warehousesupervisor {
+
+    yang-version 1;
+
+    namespace "ydt.warehouse-supervisor";
+
+    prefix "warehouse";
+
+    organization "ON-LAB";
+
+    description "This module defines for warehouse-supervisor.";
+
+    revision "2016-05-24" {
+        description "Initial revision.";
+    }
+
+    leaf-list supervisor {
+        type string;
+        description "name of the warehouse-supervisor's";
+    }
+}
\ No newline at end of file
diff --git a/apps/yms/app/src/test/resources/ydtTestYangFiles/yms-network-topology.yang b/apps/yms/app/src/test/resources/ydtTestYangFiles/yms-network-topology.yang
new file mode 100644
index 0000000..6b9452c
--- /dev/null
+++ b/apps/yms/app/src/test/resources/ydtTestYangFiles/yms-network-topology.yang
@@ -0,0 +1,304 @@
+ module yms-network-topology {
+   yang-version 1;
+   namespace "urn:ietf:params:xml:ns:yang:ietf-network-topology";
+   prefix lnk;
+
+   import yms-ietf-inet-types {
+     prefix inet;
+   }
+   import yms-ietf-network {
+     prefix nd;
+   }
+
+   organization
+     "IETF I2RS (Interface to the Routing System) Working Group";
+
+   contact
+     "WG Web:    <http://tools.ietf.org/wg/i2rs/>
+      WG List:   <mailto:i2rs@ietf.org>
+
+      WG Chair:  Susan Hares
+                 <mailto:shares@ndzh.com>
+
+      WG Chair:  Jeffrey Haas
+                 <mailto:jhaas@pfrc.org>
+
+      Editor:    Alexander Clemm
+                 <mailto:alex@cisco.com>
+
+      Editor:    Jan Medved
+                 <mailto:jmedved@cisco.com>
+
+      Editor:    Robert Varga
+                 <mailto:rovarga@cisco.com>
+
+      Editor:    Tony Tkacik
+                 <mailto:ttkacik@cisco.com>
+
+      Editor:    Nitin Bahadur
+                 <mailto:nitin_bahadur@yahoo.com>
+
+      Editor:    Hariharan Ananthakrishnan
+                 <mailto:hari@packetdesign.com>";
+
+   description
+     "This module defines a common base model for network topology,
+      augmenting the base network model with links to connect nodes,
+      as well as termination points to terminate links on nodes.
+
+      Copyright (c) 2015 IETF Trust and the persons identified as
+      authors of the code.  All rights reserved.
+
+      Redistribution and use in source and binary forms, with or
+      without modification, is permitted pursuant to, and subject
+      to the license terms contained in, the Simplified BSD License
+      set forth in Section 4.c of the IETF Trust's Legal Provisions
+      Relating to IETF Documents
+      (http://trustee.ietf.org/license-info).
+
+      This version of this YANG module is part of
+      draft-ietf-i2rs-yang-network-topo-02;
+      see the RFC itself for full legal notices.
+
+      NOTE TO RFC EDITOR: Please replace above reference to
+      draft-ietf-i2rs-yang-network-topo-02 with RFC
+      number when published (i.e. RFC xxxx).";
+
+   revision 2015-12-08 {
+     description
+       "Initial revision.
+        NOTE TO RFC EDITOR: Please replace the following reference
+        to draft-ietf-i2rs-yang-network-topo-02 with
+        RFC number when published (i.e. RFC xxxx).";
+     reference
+       "draft-ietf-i2rs-yang-network-topo-02.";
+   }
+
+   typedef link-id {
+     type inet:uri;
+     description
+       "An identifier for a link in a topology.
+        The identifier SHOULD be chosen such that the same link in a
+        real network topology will always be identified through the
+        same identifier, even if the model is instantiated in
+            separate datastores. An implementation MAY choose to capture
+        semantics in the identifier, for example to indicate the type
+        of link and/or the type of topology that the link is a part
+        of.";
+   }
+
+   typedef tp-id {
+     type inet:uri;
+     description
+       "An identifier for termination points on a node.
+        The identifier SHOULD be chosen such that the same TP in a
+        real network topology will always be identified through the
+        same identifier, even if the model is instantiated in
+        separate datastores. An implementation MAY choose to capture
+        semantics in the identifier, for example to indicate the type
+        of TP and/or the type of node and topology that the TP is a
+        part of.";
+   }
+   grouping link-ref {
+     description
+       "References a link in a specific network.";
+     leaf link-ref {
+       type leafref {
+         path "/nd:networks/nd:network[nd:network-id=current()/../"+
+           "network-ref]/lnk:link/lnk:link-id";
+         require-instance false;
+       }
+       description
+         "A type for an absolute reference a link instance.
+          (This type should not be used for relative references.
+          In such a case, a relative path should be used instead.)";
+     }
+     uses nd:network-ref;
+   }
+
+   grouping tp-ref {
+     description
+       "References a termination point in a specific node.";
+     leaf tp-ref {
+       type leafref {
+         path "/nd:networks/nd:network[nd:network-id=current()/../"+
+           "network-ref]/nd:node[nd:node-id=current()/../"+
+           "node-ref]/lnk:termination-point/lnk:tp-id";
+         require-instance false;
+       }
+       description
+         "A type for an absolute reference to a termination point.
+          (This type should not be used for relative references.
+          In such a case, a relative path should be used instead.)";
+     }
+     uses nd:node-ref;
+   }
+
+   augment "/nd:networks/nd:network" {
+     description
+       "Add links to the network model.";
+     list link {
+       key "link-id";
+       description
+         "A Network Link connects a by Local (Source) node and
+          a Remote (Destination) Network Nodes via a set of the
+          nodes' termination points.
+          As it is possible to have several links between the same
+          source and destination nodes, and as a link could
+          potentially be re-homed between termination points, to
+          ensure that we would always know to distinguish between
+          links, every link is identified by a dedicated link
+          identifier.
+          Note that a link models a point-to-point link, not a
+          multipoint link.
+          Layering dependencies on links in underlay topologies are
+          not represented as the layering information of nodes and of
+          termination points is sufficient.";
+       container source {
+         description
+           "This container holds the logical source of a particular
+            link.";
+         leaf source-node {
+           type leafref {
+             path "../../../nd:node/nd:node-id";
+           }
+           mandatory true;
+           description
+             "Source node identifier, must be in same topology.";
+         }
+         leaf source-tp {
+           type leafref {
+             path "../../../nd:node[nd:node-id=current()/../"+
+               "source-node]/t-point/tp-id";
+           }
+           description
+             "Termination point within source node that terminates
+              the link.";
+         }
+       }
+       container destination {
+         description
+           "This container holds the logical destination of a
+            particular link.";
+         leaf dest-node {
+           type leafref {
+             path "../../../nd:node/nd:node-id";
+           }
+           mandatory true;
+           description
+             "Destination node identifier, must be in the same
+              network.";
+         }
+         leaf dest-tp {
+           type leafref {
+             path "../../../nd:node[nd:node-id=current()/../"+
+               "dest-node]/t-point/tp-id";
+           }
+           description
+             "Termination point within destination node that
+              terminates the link.";
+         }
+       }
+       leaf link-id {
+         type link-id;
+         description
+           "The identifier of a link in the topology.
+            A link is specific to a topology to which it belongs.";
+       }
+       list supporting-link {
+         key "network-ref link-ref";
+         description
+           "Identifies the link, or links, that this link
+            is dependent on.";
+         leaf network-ref {
+           type leafref {
+             path "../../../nd:supporting-network/nd:network-ref";
+           require-instance false;
+           }
+           description
+             "This leaf identifies in which underlay topology
+              supporting link is present.";
+         }
+         leaf link-ref {
+           type leafref {
+             path "/nd:networks/nd:network[nd:network-id=current()/"+
+               "../network-ref]/link/link-id";
+             require-instance false;
+           }
+           description
+             "This leaf identifies a link which is a part
+              of this link's underlay. Reference loops, in which
+              a link identifies itself as its underlay, either
+              directly or transitively, are not allowed.";
+         }
+       }
+     }
+
+     leaf link-id {
+        type link-id;
+        description
+            "The identifier of a link in the topology.
+             A link is specific to a topology to which it belongs.";
+     }
+   }
+   augment "/nd:networks/nd:network/nd:node" {
+     description
+       "Augment termination points which terminate links.
+        Termination points can ultimately be mapped to interfaces.";
+     list t-point {
+       key "tp-id";
+       description
+         "A termination point can terminate a link.
+          Depending on the type of topology, a termination point
+          could, for example, refer to a port or an interface.";
+       leaf tp-id {
+         type tp-id;
+         description
+           "Termination point identifier.";
+       }
+       list supporting-termination-point {
+         key "network-ref node-ref tp-ref";
+         description
+           "The leaf list identifies any termination points that
+            the termination point is dependent on, or maps onto.
+            Those termination points will themselves be contained
+            in a supporting node.
+            This dependency information can be inferred from
+            the dependencies between links.  For this reason,
+            this item is not separately configurable.  Hence no
+            corresponding constraint needs to be articulated.
+            The corresponding information is simply provided by the
+            implementing system.";
+         leaf network-ref {
+           type leafref {
+             path "../../../nd:supporting-node/nd:network-ref";
+           require-instance false;
+           }
+           description
+             "This leaf identifies in which topology the
+              supporting termination point is present.";
+         }
+         leaf node-ref {
+           type leafref {
+             path "../../../nd:supporting-node/nd:node-ref";
+           require-instance false;
+           }
+           description
+             "This leaf identifies in which node the supporting
+              termination point is present.";
+         }
+         leaf tp-ref {
+           type leafref {
+             path "/nd:networks/nd:network[nd:network-id=current()/"+
+               "../network-ref]/nd:node[nd:node-id=current()/../"+
+               "node-ref]/t-point/tp-id";
+             require-instance false;
+           }
+           description
+             "Reference to the underlay node, must be in a
+              different topology";
+         }
+       }
+     }
+   }
+ }