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diff --git a/offapi/com/sun/star/chart/XChartData.idl b/offapi/com/sun/star/chart/XChartData.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_chart_XChartData_idl__
+#define __com_sun_star_chart_XChartData_idl__
+
+#include <com/sun/star/uno/XInterface.idl>
+
+#include <com/sun/star/chart/XChartDataChangeEventListener.idl>
+
+
+
+ module com {  module sun {  module star {  module chart {
+
+
+/** manages the data of the chart.
+
+    @see XChartDocument
+ */
+published interface XChartData: com::sun::star::uno::XInterface
+{
+
+    /** allows a component supporting the
+        XChartDataChangeEventListener interface to
+        register as listener.  The component will be notified with a
+        ChartDataChangeEvent every time the chart's data
+        changes.</p>
+
+        @param aListener
+            the component that is to be added as listener
+
+        @see XChartDataChangeEventListener
+        @see ChartDataChangeEvent
+     */
+    void addChartDataChangeEventListener( [in] com::sun::star::chart::XChartDataChangeEventListener aListener );
+
+
+    /** removes a previously registered listener.
+
+        @param aListener
+            the component that is to be removed
+     */
+    void removeChartDataChangeEventListener( [in] com::sun::star::chart::XChartDataChangeEventListener aListener );
+
+
+    /** @returns
+            the value which is to be used as an indicator for a
+            missing value in the data.
+
+        <p>In IEEE arithmetic format it is one of the NaN values, so
+        there are no conflicts with existing numeric values.</p>
+     */
+    double getNotANumber();
+
+
+    /** checks whether the value given is equal to the indicator value
+        for a missing value.
+
+        <p>In IEEE arithmetic format it is one of the NaN values, so
+        there are no conflicts with existing numeric values.</p>
+
+        <p>Always use this method to check, if a value is <em>not a
+        number</em>.  If you compare the value returned by
+        XChartData::getNotANumber() to another double
+        value using the = operator, you may not get the desired
+        result!</p>
+
+        @returns
+            `TRUE` if the number given is interpreted by the chart as
+            a missing value.
+
+        @param nNumber
+            the number that you want to check for validity.
+     */
+    boolean isNotANumber( [in] double nNumber );
+
+};
+
+
+}; }; }; };
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */