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diff --git a/offapi/com/sun/star/chart2/data/DataFilter.idl b/offapi/com/sun/star/chart2/data/DataFilter.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_chart2_data_DataFilter_idl
+#define com_sun_star_chart2_data_DataFilter_idl
+
+#include <com/sun/star/chart2/data/DataSource.idl>
+#include <com/sun/star/chart2/data/DataSink.idl>
+
+module com
+{
+module sun
+{
+module star
+{
+module chart2
+{
+module data
+{
+
+/** A filter gets some data and provides some data.  The received data
+    is typically (but not necessarily) different from the data that
+    can be retrieved by a filter.
+  */
+service DataFilter
+{
+    /** A DataFilter is a DataSink, because you can set some data at a
+        DataFilter.
+     */
+    service DataSink;
+
+    /** A DataFilter is a DataSource, because you can get some data
+        from a DataFilter.
+     */
+    service DataSource;
+};
+
+} ; // data
+} ; // chart2
+} ; // com
+} ; // sun
+} ; // star
+
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */