diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangNode.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangNode.java
index 0413e653..ae29433 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangNode.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangNode.java
@@ -16,6 +16,7 @@
 package org.onosproject.yangutils.datamodel;
 
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.parser.Parsable;
 import org.onosproject.yangutils.translator.tojava.TraversalType;
 
 import static org.onosproject.yangutils.translator.tojava.TraversalType.CHILD;
@@ -281,9 +282,11 @@
                 if (nextNodeToClone == null) {
                     throw new DataModelException("Internal error: Cloning failed, source tree null pointer reached");
                 }
-
-                if (curTraversal == CHILD) {
+                if (curTraversal != PARENT) {
                     newNode = nextNodeToClone.clone();
+                    detectCollisionWhileCloning(clonedTreeCurNode, newNode, curTraversal);
+                }
+                if (curTraversal == CHILD) {
 
                     /**
                      * add the new node to the cloned tree.
@@ -295,7 +298,6 @@
                      */
                     clonedTreeCurNode = newNode;
                 } else if (curTraversal == SIBILING) {
-                    newNode = nextNodeToClone.clone();
 
                     clonedTreeCurNode.addNextSibling(newNode);
                     clonedTreeCurNode = newNode;
@@ -328,6 +330,38 @@
     }
 
     /**
+     * Detects collision when the grouping is deep copied to the uses's parent.
+     *
+     * @param currentNode parent/previous sibling node for the new node
+     * @param newNode node which has to be added
+     * @param addAs traversal type of the node
+     * @throws DataModelException data model error
+     */
+    private static void detectCollisionWhileCloning(YangNode currentNode, YangNode newNode, TraversalType addAs)
+            throws DataModelException {
+        if ((!(currentNode instanceof CollisionDetector))
+                || (!(newNode instanceof Parsable))) {
+            throw new DataModelException("Node in data model tree does not support collision detection");
+        }
+
+        CollisionDetector collisionDetector = (CollisionDetector) currentNode;
+        Parsable parsable = (Parsable) newNode;
+        if (addAs == TraversalType.CHILD) {
+            collisionDetector.detectCollidingChild(newNode.getName(), parsable.getYangConstructType());
+        } else if (addAs == TraversalType.SIBILING) {
+            currentNode = currentNode.getParent();
+            if (!(currentNode instanceof CollisionDetector)) {
+                throw new DataModelException("Node in data model tree does not support collision detection");
+            }
+            collisionDetector = (CollisionDetector) currentNode;
+            collisionDetector.detectCollidingChild(newNode.getName(), parsable.getYangConstructType());
+        } else {
+            throw new DataModelException("Errored tree cloning");
+        }
+
+    }
+
+    /**
      * Add a new next sibling.
      *
      * @param newSibling new sibling to be added
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangUses.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangUses.java
index 7f9b4a3..16f45c4 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangUses.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangUses.java
@@ -19,6 +19,7 @@
 import org.onosproject.yangutils.parser.Parsable;
 import org.onosproject.yangutils.utils.YangConstructType;
 
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.detectCollidingChildUtil;
 import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getParentNodeInGenCode;
 
 /*-
@@ -56,7 +57,7 @@
  */
 public class YangUses
         extends YangNode
-        implements YangCommonInfo, Parsable, Resolvable {
+        implements YangCommonInfo, Parsable, Resolvable, CollisionDetector {
 
     /**
      * YANG node identifier.
@@ -267,18 +268,23 @@
         }
 
         YangNode usesParentNode = getParentNodeInGenCode(this);
-        if (!(usesParentNode instanceof YangLeavesHolder)) {
+        if ((!(usesParentNode instanceof YangLeavesHolder))
+                || (!(usesParentNode instanceof CollisionDetector))) {
             throw new DataModelException("YANG uses holder construct is wrong");
         }
 
         YangLeavesHolder usesParentLeavesHolder = (YangLeavesHolder) usesParentNode;
         if (referredGrouping.getListOfLeaf() != null) {
             for (YangLeaf leaf : referredGrouping.getListOfLeaf()) {
+                ((CollisionDetector) usesParentLeavesHolder).detectCollidingChild(leaf.getLeafName(),
+                        YangConstructType.LEAF_DATA);
                 usesParentLeavesHolder.addLeaf(leaf);
             }
         }
         if (referredGrouping.getListOfLeafList() != null) {
             for (YangLeafList leafList : referredGrouping.getListOfLeafList()) {
+                ((CollisionDetector) usesParentLeavesHolder).detectCollidingChild(leafList.getLeafName(),
+                        YangConstructType.LEAF_LIST_DATA);
                 usesParentLeavesHolder.addLeafList(leafList);
             }
         }
@@ -295,4 +301,19 @@
     public void setResolvableStatus(ResolvableStatus resolvableStatus) {
         this.resolvableStatus = resolvableStatus;
     }
+
+    @Override
+    public void detectCollidingChild(String identifierName, YangConstructType dataType) throws DataModelException {
+        detectCollidingChildUtil(identifierName, dataType, this);
+    }
+
+    @Override
+    public void detectSelfCollision(String identifierName, YangConstructType dataType) throws DataModelException {
+
+        if (getName().equals(identifierName)) {
+            throw new DataModelException("YANG file error: Duplicate input identifier detected, same as uses \""
+                    + getName() + "\"");
+        }
+    }
+
 }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/utils/DataModelUtils.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/utils/DataModelUtils.java
index 643eda5..e848299 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/utils/DataModelUtils.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/utils/DataModelUtils.java
@@ -27,9 +27,9 @@
 import org.onosproject.yangutils.datamodel.YangNode;
 import org.onosproject.yangutils.datamodel.YangResolutionInfo;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.parser.Parsable;
 import org.onosproject.yangutils.utils.YangConstructType;
 
-
 /**
  * Represents utilities for data model tree.
  */
@@ -53,21 +53,44 @@
     public static void detectCollidingChildUtil(String identifierName, YangConstructType dataType, YangNode node)
             throws DataModelException {
 
-        if (dataType == YangConstructType.LEAF_DATA) {
-            YangLeavesHolder leavesHolder = (YangLeavesHolder) node;
-            if (leavesHolder.getListOfLeaf() != null) {
-                detectCollidingLeaf(leavesHolder, identifierName);
-            }
-        }
-        if (dataType == YangConstructType.LEAF_LIST_DATA) {
-            if (((YangLeavesHolder) node).getListOfLeafList() != null) {
+        if (dataType == YangConstructType.USES_DATA || dataType == YangConstructType.GROUPING_DATA) {
+            detectCollidingForUsesGrouping(identifierName, dataType, node);
+        } else {
+            if (node instanceof YangLeavesHolder) {
                 YangLeavesHolder leavesHolder = (YangLeavesHolder) node;
-                detectCollidingLeafList(leavesHolder, identifierName);
+                detectCollidingLeaf(leavesHolder.getListOfLeaf(), identifierName);
+                detectCollidingLeafList(leavesHolder.getListOfLeafList(), identifierName);
+            }
+            node = node.getChild();
+            while (node != null) {
+                Parsable parsable = (Parsable) node;
+                if (node instanceof CollisionDetector
+                        && (parsable.getYangConstructType() != YangConstructType.USES_DATA)
+                        && (parsable.getYangConstructType() != YangConstructType.GROUPING_DATA)) {
+                    ((CollisionDetector) node).detectSelfCollision(identifierName, dataType);
+                }
+                node = node.getNextSibling();
             }
         }
+    }
+
+    /**
+     * Detects colliding of uses and grouping only with uses and grouping respectively.
+     *
+     * @param identifierName name for which collision detection is to be
+     * checked
+     * @param dataType type of YANG node asking for detecting collision
+     * @param node node instance of calling node
+     * @throws DataModelException a violation of data model rules
+     */
+    public static void detectCollidingForUsesGrouping(String identifierName, YangConstructType dataType, YangNode node)
+            throws DataModelException {
+
         node = node.getChild();
         while (node != null) {
-            if (node instanceof CollisionDetector) {
+            Parsable parsable = (Parsable) node;
+            if (node instanceof CollisionDetector
+                    && (parsable.getYangConstructType() == dataType)) {
                 ((CollisionDetector) node).detectSelfCollision(identifierName, dataType);
             }
             node = node.getNextSibling();
@@ -77,15 +100,18 @@
     /**
      * Detects the colliding identifier name in a given leaf node.
      *
-     * @param leavesHolder leaves node against which collision to be checked
+     * @param listOfLeaf List of leaves to detect collision
      * @param identifierName name for which collision detection is to be
      * checked
      * @throws DataModelException a violation of data model rules
      */
-    private static void detectCollidingLeaf(YangLeavesHolder leavesHolder, String identifierName)
+    private static void detectCollidingLeaf(List<YangLeaf> listOfLeaf, String identifierName)
             throws DataModelException {
 
-        for (YangLeaf leaf : leavesHolder.getListOfLeaf()) {
+        if (listOfLeaf == null) {
+            return;
+        }
+        for (YangLeaf leaf : listOfLeaf) {
             if (leaf.getLeafName().equals(identifierName)) {
                 throw new DataModelException("YANG file error: Duplicate input identifier detected, same as leaf \""
                         + leaf.getLeafName() + "\"");
@@ -96,15 +122,18 @@
     /**
      * Detects the colliding identifier name in a given leaf-list node.
      *
-     * @param leavesHolder leaves node against which collision to be checked
+     * @param listOfLeafList list of leaf-lists to detect collision
      * @param identifierName name for which collision detection is to be
      * checked
      * @throws DataModelException a violation of data model rules
      */
-    private static void detectCollidingLeafList(YangLeavesHolder leavesHolder, String identifierName)
+    private static void detectCollidingLeafList(List<YangLeafList> listOfLeafList, String identifierName)
             throws DataModelException {
 
-        for (YangLeafList leafList : leavesHolder.getListOfLeafList()) {
+        if (listOfLeafList == null) {
+            return;
+        }
+       for (YangLeafList leafList : listOfLeafList) {
             if (leafList.getLeafName().equals(identifierName)) {
                 throw new DataModelException("YANG file error: Duplicate input identifier detected, same as leaf " +
                         "list \"" + leafList.getLeafName() + "\"");
@@ -122,8 +151,6 @@
     public static void addResolutionInfo(YangResolutionInfo resolutionInfo)
             throws DataModelException {
 
-
-
         /* get the module node to add maintain the list of nested reference */
         YangNode curNode = resolutionInfo.getEntityToResolveInfo()
                 .getHolderOfEntityToResolve();
@@ -142,6 +169,13 @@
         resolutionNode.addToResolutionList(resolutionInfo);
     }
 
+    /**
+     * Evaluates whether the prefix in uses/type is valid.
+     *
+     * @param entityPrefix prefix in the current module/sub-module
+     * @param resolutionNode uses/type node which has the prefix with it
+     * @return whether prefix is valid or not
+     */
     private static boolean isPrefixValid(String entityPrefix, HasResolutionInfo resolutionNode) {
         if (entityPrefix == null) {
             return true;
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java
index 8304c8e..14c07b7 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java
@@ -1565,22 +1565,6 @@
 
     /**
      * Enter a parse tree produced by GeneratedYangParser for grammar rule
-     * inputStatementBody.
-     *
-     * @param currentContext current context in the parsed tree
-     */
-    void enterInputStatementBody(GeneratedYangParser.InputStatementBodyContext currentContext);
-
-    /**
-     * Exit a parse tree produced by GeneratedYangParser for grammar rule
-     * inputStatementBody.
-     *
-     * @param currentContext current context in the parsed tree
-     */
-    void exitInputStatementBody(GeneratedYangParser.InputStatementBodyContext currentContext);
-
-    /**
-     * Enter a parse tree produced by GeneratedYangParser for grammar rule
      * outputStatement.
      *
      * @param currentContext current context in the parsed tree
@@ -1597,22 +1581,6 @@
 
     /**
      * Enter a parse tree produced by GeneratedYangParser for grammar rule
-     * outputStatementBody.
-     *
-     * @param currentContext current context in the parsed tree
-     */
-    void enterOutputStatementBody(GeneratedYangParser.OutputStatementBodyContext currentContext);
-
-    /**
-     * Exit a parse tree produced by GeneratedYangParser for grammar rule
-     * outputStatementBody.
-     *
-     * @param currentContext current context in the parsed tree
-     */
-    void exitOutputStatementBody(GeneratedYangParser.OutputStatementBodyContext currentContext);
-
-    /**
-     * Enter a parse tree produced by GeneratedYangParser for grammar rule
      * notificationStatement.
      *
      * @param currentContext current context in the parsed tree
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java
index 51f3928..c1c84a1 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java
@@ -52,8 +52,8 @@
 import org.onosproject.yangutils.parser.impl.listeners.MaxElementsListener;
 import org.onosproject.yangutils.parser.impl.listeners.MinElementsListener;
 import org.onosproject.yangutils.parser.impl.listeners.ModuleListener;
-import org.onosproject.yangutils.parser.impl.listeners.NotificationListener;
 import org.onosproject.yangutils.parser.impl.listeners.NamespaceListener;
+import org.onosproject.yangutils.parser.impl.listeners.NotificationListener;
 import org.onosproject.yangutils.parser.impl.listeners.OrganizationListener;
 import org.onosproject.yangutils.parser.impl.listeners.OutputListener;
 import org.onosproject.yangutils.parser.impl.listeners.PatternRestrictionListener;
@@ -1087,14 +1087,6 @@
     }
 
     @Override
-    public void enterInputStatementBody(GeneratedYangParser.InputStatementBodyContext ctx) {
-    }
-
-    @Override
-    public void exitInputStatementBody(GeneratedYangParser.InputStatementBodyContext ctx) {
-    }
-
-    @Override
     public void enterOutputStatement(GeneratedYangParser.OutputStatementContext ctx) {
         OutputListener.processOutputEntry(this, ctx);
     }
@@ -1105,14 +1097,6 @@
     }
 
     @Override
-    public void enterOutputStatementBody(GeneratedYangParser.OutputStatementBodyContext ctx) {
-    }
-
-    @Override
-    public void exitOutputStatementBody(GeneratedYangParser.OutputStatementBodyContext ctx) {
-    }
-
-    @Override
     public void enterNotificationStatement(GeneratedYangParser.NotificationStatementContext ctx) {
         NotificationListener.processNotificationEntry(this, ctx);
     }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListener.java
index c81e554..67dacbb 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListener.java
@@ -46,12 +46,10 @@
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
-import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateMutuallyExclusiveChilds;
 import static org.onosproject.yangutils.utils.YangConstructType.DESCRIPTION_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.GROUPING_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.REFERENCE_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.STATUS_DATA;
-import static org.onosproject.yangutils.utils.YangConstructType.TYPEDEF_DATA;
 
 /*
  * Reference: RFC6020 and YANG ANTLR Grammar
@@ -168,7 +166,5 @@
         validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, GROUPING_DATA,
                 ctx.identifier().getText());
         validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, GROUPING_DATA, ctx.identifier().getText());
-        validateMutuallyExclusiveChilds(ctx.typedefStatement(), TYPEDEF_DATA, ctx.groupingStatement(), GROUPING_DATA,
-                GROUPING_DATA, ctx.identifier().getText());
     }
 }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/InputListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/InputListener.java
index bb1ba85..78a5153 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/InputListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/InputListener.java
@@ -36,6 +36,8 @@
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityNonZero;
+import static org.onosproject.yangutils.utils.YangConstructType.DATA_DEF_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.INPUT_DATA;
 
 /*
@@ -86,6 +88,9 @@
         // Check for stack to be non empty.
         checkStackIsNotEmpty(listener, MISSING_HOLDER, INPUT_DATA, "", ENTRY);
 
+        validateCardinalityNonZero(ctx.dataDefStatement(), DATA_DEF_DATA,
+                INPUT_DATA, "", ctx);
+
         Parsable curData = listener.getParsedDataStack().peek();
         if (curData instanceof YangRpc) {
 
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java
index a6c5496..42326b7 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java
@@ -19,6 +19,7 @@
 import org.onosproject.yangutils.datamodel.YangAugment;
 import org.onosproject.yangutils.datamodel.YangCase;
 import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
 import org.onosproject.yangutils.datamodel.YangInput;
 import org.onosproject.yangutils.datamodel.YangList;
 import org.onosproject.yangutils.datamodel.YangModule;
@@ -140,7 +141,7 @@
         if (curData instanceof YangModule || curData instanceof YangContainer
                 || curData instanceof YangList || curData instanceof YangCase
                 || curData instanceof YangNotification || curData instanceof YangInput
-                || curData instanceof YangOutput || curData instanceof YangAugment) {
+                || curData instanceof YangOutput || curData instanceof YangAugment || curData instanceof YangGrouping) {
             curNode = (YangNode) curData;
             try {
                 curNode.addChild(yangList);
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListener.java
index 58daefb..1bd7390 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListener.java
@@ -40,13 +40,10 @@
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
-import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateMutuallyExclusiveChilds;
 import static org.onosproject.yangutils.utils.YangConstructType.DESCRIPTION_DATA;
-import static org.onosproject.yangutils.utils.YangConstructType.GROUPING_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.NOTIFICATION_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.REFERENCE_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.STATUS_DATA;
-import static org.onosproject.yangutils.utils.YangConstructType.TYPEDEF_DATA;
 
 /*
  * Reference: RFC6020 and YANG ANTLR Grammar
@@ -159,7 +156,5 @@
                 ctx.identifier().getText());
         validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, NOTIFICATION_DATA,
                 ctx.identifier().getText());
-        validateMutuallyExclusiveChilds(ctx.typedefStatement(), TYPEDEF_DATA, ctx.groupingStatement(), GROUPING_DATA,
-                NOTIFICATION_DATA, ctx.identifier().getText());
     }
 }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OutputListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OutputListener.java
index 2dfa2ed..83fec50 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OutputListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OutputListener.java
@@ -36,6 +36,8 @@
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityNonZero;
+import static org.onosproject.yangutils.utils.YangConstructType.DATA_DEF_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.OUTPUT_DATA;
 
 /*
@@ -86,6 +88,9 @@
         // Check for stack to be non empty.
         checkStackIsNotEmpty(listener, MISSING_HOLDER, OUTPUT_DATA, "", ENTRY);
 
+        validateCardinalityNonZero(ctx.dataDefStatement(), DATA_DEF_DATA,
+                OUTPUT_DATA, "", ctx);
+
         Parsable curData = listener.getParsedDataStack().peek();
         if (curData instanceof YangRpc) {
 
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RpcListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RpcListener.java
index ae9e04c..b440289 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RpcListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RpcListener.java
@@ -37,12 +37,9 @@
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
-import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateMutuallyExclusiveChilds;
 import static org.onosproject.yangutils.utils.YangConstructType.RPC_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.INPUT_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.OUTPUT_DATA;
-import static org.onosproject.yangutils.utils.YangConstructType.TYPEDEF_DATA;
-import static org.onosproject.yangutils.utils.YangConstructType.GROUPING_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.STATUS_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.REFERENCE_DATA;
 import static org.onosproject.yangutils.utils.YangConstructType.DESCRIPTION_DATA;
@@ -157,8 +154,6 @@
         validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, RPC_DATA, ctx.identifier().getText());
         validateCardinalityMaxOne(ctx.inputStatement(), INPUT_DATA, RPC_DATA, ctx.identifier().getText());
         validateCardinalityMaxOne(ctx.outputStatement(), OUTPUT_DATA, RPC_DATA, ctx.identifier().getText());
-        validateMutuallyExclusiveChilds(ctx.typedefStatement(), TYPEDEF_DATA, ctx.groupingStatement(), GROUPING_DATA,
-                RPC_DATA, ctx.identifier().getText());
     }
 
 }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java
index bfa22a4..b0a3b69 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java
@@ -17,6 +17,7 @@
 package org.onosproject.yangutils.parser.impl.listeners;
 
 import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
 import org.onosproject.yangutils.datamodel.YangInput;
 import org.onosproject.yangutils.datamodel.YangList;
 import org.onosproject.yangutils.datamodel.YangModule;
@@ -127,11 +128,8 @@
 
         if (curData instanceof YangModule || curData instanceof YangSubModule || curData instanceof YangContainer
                 || curData instanceof YangList || curData instanceof YangNotification || curData instanceof YangRpc
-                || curData instanceof YangInput || curData instanceof YangOutput) {
+                || curData instanceof YangInput || curData instanceof YangOutput || curData instanceof YangGrouping) {
 
-            /*
-             * TODO YangGrouping.
-             */
             YangNode curNode = (YangNode) curData;
             try {
                 curNode.addChild(typeDefNode);
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UsesListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UsesListener.java
index 4e2925a..1658eee 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UsesListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UsesListener.java
@@ -23,8 +23,10 @@
 import org.onosproject.yangutils.datamodel.YangList;
 import org.onosproject.yangutils.datamodel.YangModule;
 import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
 import org.onosproject.yangutils.datamodel.YangNotification;
 import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangResolutionInfo;
 import org.onosproject.yangutils.datamodel.YangSubModule;
 import org.onosproject.yangutils.datamodel.YangUses;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
@@ -33,16 +35,18 @@
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.TreeWalkListener;
 
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.addResolutionInfo;
 import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
 import static org.onosproject.yangutils.datamodel.utils.YangDataModelFactory.getYangUsesNode;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
-import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidNodeIdentifier;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
 import static org.onosproject.yangutils.utils.YangConstructType.DESCRIPTION_DATA;
@@ -116,6 +120,11 @@
         // Validate sub statement cardinality.
         validateSubStatementsCardinality(ctx);
 
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+
+        detectCollidingChildUtil(listener, line, charPositionInLine, ctx.string().getText(), USES_DATA);
         Parsable curData = listener.getParsedDataStack().peek();
 
         if (curData instanceof YangModule || curData instanceof YangSubModule
@@ -126,8 +135,8 @@
                 || curData instanceof YangNotification) {
 
             YangUses usesNode = getYangUsesNode(JAVA_GENERATION);
-            usesNode.setName(ctx.string().getText());
-
+            YangNodeIdentifier nodeIdentifier = getValidNodeIdentifier(ctx.string().getText(), USES_DATA, ctx);
+            usesNode.setNodeIdentifier(nodeIdentifier);
             YangNode curNode = (YangNode) curData;
 
             try {
@@ -156,12 +165,29 @@
         // Check for stack to be non empty.
         checkStackIsNotEmpty(listener, MISSING_HOLDER, USES_DATA, ctx.string().getText(), EXIT);
 
-        if (listener.getParsedDataStack().peek() instanceof YangUses) {
-            listener.getParsedDataStack().pop();
-        } else {
-            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, USES_DATA,
+        Parsable parsableUses = listener.getParsedDataStack().pop();
+        if (!(parsableUses instanceof YangUses)) {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, USES_DATA,
                     ctx.string().getText(), EXIT));
         }
+        YangUses uses = (YangUses) parsableUses;
+        int errorLine = ctx.getStart().getLine();
+        int errorPosition = ctx.getStart().getCharPositionInLine();
+
+        // Parent YANG node of uses to be added in resolution information.
+        Parsable parentNode = listener.getParsedDataStack().peek();
+
+        // Verify parent node of leaf
+        if (!(parentNode instanceof YangNode)) {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, USES_DATA,
+                    ctx.string().getText(), EXIT));
+        }
+
+        // Add resolution information to the list
+        YangResolutionInfo resolutionInfo = new YangResolutionInfo<YangUses>(uses,
+                (YangNode) parentNode, errorLine,
+                errorPosition);
+        addToResolutionList(resolutionInfo, ctx);
     }
 
     // TODO linker to handle collision scenarios like leaf obtained by uses, conflicts with some existing leaf.
@@ -175,5 +201,23 @@
         validateCardinalityMaxOne(ctx.whenStatement(), WHEN_DATA, USES_DATA, ctx.string().getText());
         validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, USES_DATA, ctx.string().getText());
         validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, USES_DATA, ctx.string().getText());
-        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, USES_DATA, ctx.string().getText());    }
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, USES_DATA, ctx.string().getText());
+    }
+
+    /**
+     * Add to resolution list.
+     *
+     * @param resolutionInfo resolution information.
+     * @param ctx context object of the grammar rule
+     */
+    private static void addToResolutionList(YangResolutionInfo<YangUses> resolutionInfo,
+            GeneratedYangParser.UsesStatementContext ctx) {
+
+        try {
+            addResolutionInfo(resolutionInfo);
+        } catch (DataModelException e) {
+            throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                    USES_DATA, ctx.string().getText(), EXIT, e.getMessage()));
+        }
+    }
 }