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diff --git a/opendaylight/sal/yang-prototype/yang/yang-data-api/src/main/java/org/opendaylight/controller/yang/data/api/SimpleNode.java b/opendaylight/sal/yang-prototype/yang/yang-data-api/src/main/java/org/opendaylight/controller/yang/data/api/SimpleNode.java
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+++ b/opendaylight/sal/yang-prototype/yang/yang-data-api/src/main/java/org/opendaylight/controller/yang/data/api/SimpleNode.java
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+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.yang.data.api;
+
+/**
+ * Simple node represents a leaf in the data tree, which does not contain any
+ * nested nodes, but the value of node. In the terms of the XML the simple node
+ * is element which contains only text data (CDATA or PCDATA). The simple node
+ * is the manifestation of the following data schema constructs in YANG:
+ * <ul>
+ * <li><b>leaf</b> - simple node could represent YANG leafs of all types except
+ * the empty type, which in XML form is similar to the empty container.</li>
+ * <li><b>item</b> in <b>leaf-list</b></li>
+ * </ul>
+ * 
+ * 
+ * @param <T>
+ */
+public interface SimpleNode<T> extends Node<T> {
+
+}