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diff --git a/slideshow/source/engine/animationnodes/nodetools.hxx b/slideshow/source/engine/animationnodes/nodetools.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_ENGINE_ANIMATIONNODES_NODETOOLS_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_ANIMATIONNODES_NODETOOLS_HXX
+
+#include <com/sun/star/drawing/XShape.hpp>
+
+#include <shapemanager.hxx>
+#include <basenode.hxx>
+#include <attributableshape.hxx>
+
+
+#if defined(DBG_UTIL)
+# define DEBUG_NODES_SHOWTREE(a) debugNodesShowTree(a);
+#else
+# define DEBUG_NODES_SHOWTREE(a)
+#endif
+
+namespace slideshow::internal
+    {
+
+        // Tools
+
+
+#if defined(DBG_UTIL)
+        OUString debugGetNodeName( const BaseNode *pNode );
+        void     debugNodesShowTree( const BaseNode* );
+#endif
+
+        /** Look up an AttributableShape from ShapeManager.
+
+            This method retrieves an AttributableShape pointer, given
+            an XShape and a LayerManager.
+
+            Throws a runtime exception if there's no such shape, or if
+            it does not implement the AttributableShape interface.
+         */
+        AttributableShapeSharedPtr lookupAttributableShape( const ShapeManagerSharedPtr&                rShapeManager,
+                                                            const css::uno::Reference< css::drawing::XShape >&    xShape );
+
+        /** Predicate whether a Begin, Duration or End timing is
+            indefinite, i.e. either contains no value, or the
+            value Timing_INDEFINITE.
+        */
+        bool isIndefiniteTiming( const css::uno::Any& rAny );
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_ANIMATIONNODES_NODETOOLS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */