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diff --git a/oox/inc/drawingml/chart/datasourcecontext.hxx b/oox/inc/drawingml/chart/datasourcecontext.hxx
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+++ b/oox/inc/drawingml/chart/datasourcecontext.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_DATASOURCECONTEXT_HXX
+#define INCLUDED_OOX_DRAWINGML_CHART_DATASOURCECONTEXT_HXX
+
+#include <memory>
+#include <drawingml/chart/chartcontextbase.hxx>
+
+class SvNumberFormatter;
+
+namespace oox::drawingml::chart {
+
+
+struct DataSequenceModel;
+
+typedef ContextBase< DataSequenceModel > DataSequenceContextBase;
+
+
+/** Handler for a double sequence context (c:numLit, c:numRef elements).
+ */
+class DoubleSequenceContext final : public DataSequenceContextBase
+{
+public:
+    explicit            DoubleSequenceContext( ::oox::core::ContextHandler2Helper& rParent, DataSequenceModel& rModel );
+    virtual             ~DoubleSequenceContext() override;
+
+    virtual ::oox::core::ContextHandlerRef onCreateContext( sal_Int32 nElement, const AttributeList& rAttribs ) override;
+    virtual void        onCharacters( const OUString& rChars ) override;
+
+private:
+    SvNumberFormatter*  getNumberFormatter();
+
+private:
+    sal_Int32           mnPtIndex;          /// Current data point index.
+    std::unique_ptr<SvNumberFormatter>
+                        mpNumberFormatter;
+};
+
+
+/** Handler for a string sequence context (c:multiLvlStrRef, c:strLit,
+    c:strRef elements).
+ */
+class StringSequenceContext final : public DataSequenceContextBase
+{
+public:
+    explicit            StringSequenceContext( ::oox::core::ContextHandler2Helper& rParent, DataSequenceModel& rModel );
+    virtual             ~StringSequenceContext() override;
+
+    virtual ::oox::core::ContextHandlerRef onCreateContext( sal_Int32 nElement, const AttributeList& rAttribs ) override;
+    virtual void        onCharacters( const OUString& rChars ) override;
+
+private:
+    sal_Int32           mnPtIndex;          /// Current data point index.
+    bool                mbReadC15;          /// Allow reading extension tags data under c15 namespace.
+};
+
+
+struct DataSourceModel;
+
+/** Handler for a data source context (c:bubbleSize, c:cat, c:minus, c:plus,
+    c:val, c:xVal, c:yVal elements).
+ */
+class DataSourceContext final : public ContextBase< DataSourceModel >
+{
+public:
+    explicit            DataSourceContext( ::oox::core::ContextHandler2Helper& rParent, DataSourceModel& rModel );
+    virtual             ~DataSourceContext() override;
+
+    virtual ::oox::core::ContextHandlerRef onCreateContext( sal_Int32 nElement, const AttributeList& rAttribs ) override;
+};
+
+
+} // namespace oox::drawingml::chart
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */