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diff --git a/oox/inc/drawingml/chart/datasourceconverter.hxx b/oox/inc/drawingml/chart/datasourceconverter.hxx
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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 INCLUDED_OOX_DRAWINGML_CHART_DATASOURCECONVERTER_HXX
+#define INCLUDED_OOX_DRAWINGML_CHART_DATASOURCECONVERTER_HXX
+
+#include <drawingml/chart/converterbase.hxx>
+
+namespace com::sun::star {
+    namespace chart2::data { class XDataSequence; }
+}
+
+namespace oox::drawingml::chart {
+
+
+struct DataSequenceModel;
+
+class DataSequenceConverter final : public ConverterBase< DataSequenceModel >
+{
+public:
+    explicit            DataSequenceConverter( const ConverterRoot& rParent, DataSequenceModel& rModel );
+    virtual             ~DataSequenceConverter() override;
+
+    /** Creates a data sequence object from the contained formula link. */
+    css::uno::Reference< css::chart2::data::XDataSequence >
+                        createDataSequence( const OUString& rRole );
+};
+
+
+struct DataSourceModel;
+
+class DataSourceConverter final : public ConverterBase< DataSourceModel >
+{
+public:
+    explicit            DataSourceConverter( const ConverterRoot& rParent, DataSourceModel& rModel );
+    virtual             ~DataSourceConverter() override;
+
+    /** Creates a data sequence object from the contained series data. */
+    css::uno::Reference< css::chart2::data::XDataSequence >
+                        createDataSequence( const OUString& rRole );
+};
+
+
+} // namespace oox::drawingml::chart
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */