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diff --git a/include/svx/DiagramDataInterface.hxx b/include/svx/DiagramDataInterface.hxx
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+++ b/include/svx/DiagramDataInterface.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_SVX_DIAGRAMDATAINTERFACE_HXX
+#define INCLUDED_SVX_DIAGRAMDATAINTERFACE_HXX
+
+#include <rtl/ustring.h>
+#include <sal/types.h>
+
+#include <utility>
+#include <vector>
+
+/// Interface class to access diagram data for UI
+class SAL_NO_VTABLE SAL_DLLPUBLIC_RTTI DiagramDataInterface
+{
+public:
+    // get text representation of data tree
+    virtual OUString getString() const = 0;
+
+    // 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 = 0;
+
+    // add new top-level node to data model, returns its id
+    virtual OUString addNode(const OUString& rText) = 0;
+
+    virtual bool removeNode(const OUString& rNodeId) = 0;
+
+protected:
+    ~DiagramDataInterface() throw() {}
+};
+
+#endif // INCLUDED_SVX_DIAGRAMDATAINTERFACE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */