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diff --git a/oox/source/drawingml/diagram/layoutatomvisitorbase.hxx b/oox/source/drawingml/diagram/layoutatomvisitorbase.hxx
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+++ b/oox/source/drawingml/diagram/layoutatomvisitorbase.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_LAYOUTATOMVISITORBASE_HXX
+#define INCLUDED_OOX_SOURCE_DRAWINGML_DIAGRAM_LAYOUTATOMVISITORBASE_HXX
+
+#include "diagram.hxx"
+#include "diagramlayoutatoms.hxx"
+
+namespace oox::drawingml {
+
+struct LayoutAtomVisitor
+{
+    virtual ~LayoutAtomVisitor() {}
+    virtual void visit(ConstraintAtom& rAtom) = 0;
+    virtual void visit(RuleAtom& rAtom) = 0;
+    virtual void visit(AlgAtom& rAtom) = 0;
+    virtual void visit(ForEachAtom& rAtom) = 0;
+    virtual void visit(ConditionAtom& rAtom) = 0;
+    virtual void visit(ChooseAtom& rAtom) = 0;
+    virtual void visit(LayoutNode& rAtom) = 0;
+    virtual void visit(ShapeAtom& rAtom) = 0;
+};
+
+// basic visitor implementation that follows if/else and for-each nodes
+// and keeps track of current position in data tree
+class LayoutAtomVisitorBase : public LayoutAtomVisitor
+{
+public:
+    LayoutAtomVisitorBase(const Diagram& rDgm, const dgm::Point* pRootPoint) :
+        mrDgm(rDgm),
+        mpCurrentNode(pRootPoint),
+        mnCurrIdx(0),
+        mnCurrStep(0),
+        mnCurrCnt(0),
+        meLookFor(LAYOUT_NODE)
+    {}
+
+    void defaultVisit(LayoutAtom const& rAtom);
+
+    using LayoutAtomVisitor::visit;
+    virtual void visit(ForEachAtom& rAtom) override;
+    virtual void visit(ConditionAtom& rAtom) override;
+    virtual void visit(ChooseAtom& rAtom) override;
+    virtual void visit(LayoutNode& rAtom) override;
+
+protected:
+    const Diagram& mrDgm;
+    const dgm::Point* mpCurrentNode;
+    sal_Int32 mnCurrIdx;
+    sal_Int32 mnCurrStep;
+    sal_Int32 mnCurrCnt;
+    enum {LAYOUT_NODE, CONSTRAINT, ALGORITHM, RULE} meLookFor;
+};
+
+class ShallowPresNameVisitor : public LayoutAtomVisitorBase
+{
+public:
+    explicit ShallowPresNameVisitor(const Diagram& rDgm, const dgm::Point* pRootPoint) :
+        LayoutAtomVisitorBase(rDgm, pRootPoint),
+        mnCnt(0)
+    {}
+
+    using LayoutAtomVisitorBase::visit;
+    virtual void visit(ConstraintAtom& rAtom) override;
+    virtual void visit(RuleAtom& rAtom) override;
+    virtual void visit(AlgAtom& rAtom) override;
+    virtual void visit(ForEachAtom& rAtom) override;
+    virtual void visit(LayoutNode& rAtom) override;
+    virtual void visit(ShapeAtom& rAtom) override;
+
+    size_t getCount() const { return mnCnt; }
+
+private:
+    size_t mnCnt;
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */