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diff --git a/offapi/com/sun/star/awt/tree/XTreeDataModel.idl b/offapi/com/sun/star/awt/tree/XTreeDataModel.idl
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+++ b/offapi/com/sun/star/awt/tree/XTreeDataModel.idl
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you 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 .
+ */
+#ifndef __com_sun_star_awt_tree_XTreeDataModel_idl__
+#define __com_sun_star_awt_tree_XTreeDataModel_idl__
+
+#include <com/sun/star/awt/tree/XTreeDataModelListener.idl>
+#include <com/sun/star/lang/IllegalArgumentException.idl>
+#include <com/sun/star/lang/XComponent.idl>
+#include <com/sun/star/awt/tree/XTreeNode.idl>
+
+
+module com {  module sun {  module star {  module awt {  module tree {
+
+
+/** An instance of this interface is used by the TreeControl to
+    retrieve the hierarchical outline data that is displayed in the actual control.
+
+    <p>If you implement your own XTreeDataModel you need to notify registered
+    XTreeDataModelListener if your model changes after the control is created.
+    If this is not done correctly the TreeControl will not update the data properly.</p>
+
+    If you do not need your own model implementation, you can also use the MutableTreeDataModel.
+*/
+interface XTreeDataModel : ::com::sun::star::lang::XComponent
+{
+    /** Returns the root of the tree.
+        <p>Returns null only if the tree has no nodes.
+
+        @returns
+            the root of the tree
+    */
+    XTreeNode getRoot();
+
+    /** Adds a listener for the TreeDataModelEvent posted after the tree changes.
+
+        @param Listener
+            the listener to add.
+    */
+    void addTreeDataModelListener( [in] XTreeDataModelListener Listener );
+
+
+    /** Removes a listener previously added with addTreeDataModelListener().
+
+        @param Listener
+            the listener to remove.
+    */
+    void removeTreeDataModelListener( [in] XTreeDataModelListener Listener );
+
+};
+
+
+}; }; }; }; };
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */