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diff --git a/offapi/com/sun/star/chart2/XInternalDataProvider.idl b/offapi/com/sun/star/chart2/XInternalDataProvider.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_XInternalDataProvider_idl
+#define com_sun_star_chart2_XInternalDataProvider_idl
+
+#include <com/sun/star/chart2/data/XDataProvider.idl>
+#include <com/sun/star/chart2/data/XDataSequence.idl>
+
+module com
+{
+module sun
+{
+module star
+{
+module chart2
+{
+
+/** An internal DataProvider that has more access to data than a plain
+    DataProvider.
+ */
+interface XInternalDataProvider  : com::sun::star::chart2::data::XDataProvider
+{
+    boolean         hasDataByRangeRepresentation( [in] string aRange );
+    sequence< any > getDataByRangeRepresentation( [in] string aRange );
+    void            setDataByRangeRepresentation( [in] string aRange, [in] sequence< any > aNewData );
+
+    /** @note  Note that -1 is allowed as the sequence is inserted
+               after the given index. So to insert a sequence as the
+               new first sequence (index 0), you would pass -1 here.
+     */
+    void insertSequence( [in] long nAfterIndex );
+    void deleteSequence( [in] long nAtIndex );
+    /** same as insertSequence with nAfterIndex being the largest
+        current index of the data, i.e. (size - 1)
+     */
+    void appendSequence();
+
+    void insertDataPointForAllSequences( [in] long nAfterIndex );
+    void deleteDataPointForAllSequences( [in] long nAtIndex );
+    void swapDataPointWithNextOneForAllSequences( [in] long nAtIndex );
+
+    /** If range representations of data sequences change due to
+        internal structural changes, they must be registered at the
+        data provider.
+
+        <p>Sequences that are directly retrieved via the methods of
+        the XDataProvider interface are already registered.  If a
+        labeled data sequence was created by cloning an existing one,
+        it has to be explicitly registered via this method.</p>
+     */
+    void registerDataSequenceForChanges( [in] com::sun::star::chart2::data::XDataSequence xSeq );
+
+    /** insert an additional sequence for categories nLevel>=1;
+    categories at level 0 are always present and cannot be inserted or deleted
+    @since OOo 3.3
+    */
+    void insertComplexCategoryLevel( [in] long nLevel );
+    /** deletes an additional sequence for categories at nLevel>=1;
+    categories at level 0 are always present and cannot be deleted
+    @since OOo 3.3
+    */
+    void deleteComplexCategoryLevel( [in] long nLevel );
+};
+
+} ; // chart2
+} ; // com
+} ; // sun
+} ; // star
+
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */