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diff --git a/oox/source/drawingml/diagram/datamodel.hxx b/oox/source/drawingml/diagram/datamodel.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_SOURCE_DRAWINGML_DIAGRAM_DATAMODEL_HXX
+#define INCLUDED_OOX_SOURCE_DRAWINGML_DIAGRAM_DATAMODEL_HXX
+
+#include <map>
+#include <memory>
+#include <vector>
+
+#include <rtl/ustring.hxx>
+
+#include <svx/diagram/datamodel.hxx>
+#include <oox/drawingml/drawingmltypes.hxx>
+#include <oox/helper/helper.hxx>
+#include <oox/token/tokens.hxx>
+
+namespace oox::drawingml {
+
+class DiagramData : public svx::diagram::DiagramData
+{
+public:
+    typedef std::map< OUString, ShapePtr > PointShapeMap;
+
+    DiagramData();
+    virtual ~DiagramData();
+
+    // creates temporary processing data from model data
+    virtual void buildDiagramDataModel(bool bClearOoxShapes);
+
+    FillPropertiesPtr& getBackgroundShapeFillProperties() { return mpBackgroundShapeFillProperties; }
+    virtual void dump() const;
+
+    Shape* getOrCreateAssociatedShape(const svx::diagram::Point& rPoint, bool bCreateOnDemand = false) const;
+
+    // get/set data between Diagram DataModel and oox::drawingml::Shape
+    void secureDataFromShapeToModelAfterDiagramImport(::oox::drawingml::Shape& rRootShape);
+    void restoreDataFromShapeToModelAfterDiagramImport(::oox::drawingml::Shape& rRootShape);
+    static void restoreDataFromModelToShapeAfterReCreation(const svx::diagram::Point& rPoint, Shape& rNewShape);
+
+protected:
+    void secureStyleDataFromShapeToModel(::oox::drawingml::Shape& rShape);
+    void restoreStyleDataFromShapeToModel(::oox::drawingml::Shape& rShape);
+
+    // The model definition, the parts *only* available in oox. Also look for already
+    // defined ModelData in svx::diagram::DiagramData
+
+    // - FillStyle for Diagram Background (empty constructed, may stay empty)
+    FillPropertiesPtr mpBackgroundShapeFillProperties;
+
+    // temporary processing data, deleted when using build(). Association
+    // map between oox::drawingml::Shape and svx::diagram::Point ModelData
+    PointShapeMap     maPointShapeMap;
+};
+
+// Oox-local definition of DiagramData. Doing and using this on Oox
+// allows to do much less static_cast(s) - if at all from svx::diagram::DiagramData
+typedef std::shared_ptr< DiagramData > OoxDiagramDataPtr;
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */