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diff --git a/oox/source/drawingml/diagram/diagramhelper.hxx b/oox/source/drawingml/diagram/diagramhelper.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_DIAGRAM_DIAGRAMHELPER_HXX
+#define INCLUDED_OOX_DRAWINGML_DIAGRAM_DIAGRAMHELPER_HXX
+
+#include <rtl/ustring.hxx>
+#include <oox/drawingml/theme.hxx>
+#include <oox/shape/ShapeFilterBase.hxx>
+#include <svx/svdogrp.hxx>
+#include <svx/diagram/IDiagramHelper.hxx>
+
+namespace svx { namespace diagram {
+    class DiagramDataState;
+}}
+
+namespace oox::drawingml {
+
+class Diagram;
+
+// Advanced DiagramHelper
+//
+// This helper tries to hold all necessary data to re-layout
+// all XShapes/SdrObjects of an already imported Diagram. The
+// Diagram holds the SmarArt model data before it gets layouted,
+// while Theme holds the oox Fill/Line/Style definitions to
+// apply.
+// Re-Layouting (re-creating) is rather complex, for detailed
+// information see ::reLayout implementation.
+// This helper class may/should be extended to:
+// - deliver representative data from the Diagram-Model
+// - modify it eventually
+// - im/export Diagram model to other representations
+class AdvancedDiagramHelper final : public svx::diagram::IDiagramHelper
+{
+    const std::shared_ptr< Diagram >            mpDiagramPtr;
+    std::shared_ptr<::oox::drawingml::Theme>    mpThemePtr;
+
+    css::awt::Size maImportSize;
+
+    bool hasDiagramData() const;
+
+public:
+    AdvancedDiagramHelper(
+        const std::shared_ptr< Diagram >& rDiagramPtr,
+        const std::shared_ptr<::oox::drawingml::Theme>& rTheme,
+        css::awt::Size aImportSize);
+    virtual ~AdvancedDiagramHelper();
+
+    // re-create XShapes
+    virtual void reLayout(SdrObjGroup& rTarget) override;
+
+    // get text representation of data tree
+    virtual OUString getString() const override;
+
+    // get children of provided data node
+    // use empty string for top-level nodes
+    // returns vector of (id, text)
+    virtual std::vector<std::pair<OUString, OUString>> getChildren(const OUString& rParentId) const override;
+
+    // add/remove new top-level node to data model, returns its id
+    virtual OUString addNode(const OUString& rText) override;
+    virtual bool removeNode(const OUString& rNodeId) override;
+
+    // Undo/Redo helpers to extract/restore Diagram-defining data
+    virtual std::shared_ptr< svx::diagram::DiagramDataState > extractDiagramDataState() const override;
+    virtual void applyDiagramDataState(const std::shared_ptr< svx::diagram::DiagramDataState >& rState) override;
+
+    void doAnchor(SdrObjGroup& rTarget, ::oox::drawingml::Shape& rRootShape);
+    std::shared_ptr< ::oox::drawingml::Theme > getOrCreateThemePtr(
+        rtl::Reference< oox::shape::ShapeFilterBase>& rxFilter ) const;
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */