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();
+}