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diff --git a/slideshow/source/inc/doctreenode.hxx b/slideshow/source/inc/doctreenode.hxx
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+++ b/slideshow/source/inc/doctreenode.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_SLIDESHOW_SOURCE_INC_DOCTREENODE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_DOCTREENODE_HXX
+
+#include <sal/types.h>
+#include <vector>
+
+
+/* Definition of DocTreeNode class */
+
+namespace slideshow::internal
+    {
+
+        /** This class represents kind of a DOM tree node for shape
+            text
+
+            In order to animate subsets of shape text, we need
+            information about the logical and formatting structure of
+            that text (lines, paragraphs, words etc.). This is
+            represented in a tree structure, with DocTreeNodes as the
+            nodes. Instances of this class can be queried from the
+            DocTreeNodeSupplier interface.
+
+            This class has nothing to do with the Draw document tree.
+         */
+        class DocTreeNode
+        {
+        public:
+            /// Type of shape entity represented by this node
+            enum class NodeType
+            {
+                /// This node represents a paragraph
+                LogicalParagraph=129,
+                /// This node represents a word
+                LogicalWord=131,
+                /// This node represents a character
+                LogicalCharacterCell=132
+            };
+
+            /** Create empty tree node
+             */
+            DocTreeNode() :
+                mnStartIndex(-1),
+                mnEndIndex(-1)
+            {
+            }
+
+            /** Create tree node from start and end index.
+
+                Create a tree node for the given range and type.
+
+                @param nStartIndex
+                Start index
+
+                @param nEndIndex
+                End index (exclusive)
+
+                @param eType
+                Node type
+             */
+            DocTreeNode( sal_Int32 nStartIndex,
+                         sal_Int32 nEndIndex ) :
+                mnStartIndex(nStartIndex),
+                mnEndIndex(nEndIndex)
+            {
+            }
+
+            bool                isEmpty() const { return mnStartIndex == mnEndIndex; }
+
+            sal_Int32           getStartIndex() const { return mnStartIndex; }
+            void                setStartIndex( sal_Int32 nIndex ) { mnStartIndex = nIndex; }
+            sal_Int32           getEndIndex() const { return mnEndIndex; }
+            void                setEndIndex( sal_Int32 nIndex ) { mnEndIndex = nIndex; }
+
+            void                reset()
+            {
+                mnStartIndex = -1;
+                mnEndIndex   = -1;
+            }
+
+        private:
+            sal_Int32   mnStartIndex;
+            sal_Int32   mnEndIndex;
+
+        };
+
+        typedef ::std::vector< DocTreeNode > VectorOfDocTreeNodes;
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_DOCTREENODE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */