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diff --git a/include/sfx2/XmlIdRegistry.hxx b/include/sfx2/XmlIdRegistry.hxx
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+++ b/include/sfx2/XmlIdRegistry.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_SFX2_XMLIDREGISTRY_HXX
+#define INCLUDED_SFX2_XMLIDREGISTRY_HXX
+
+#include <sal/config.h>
+
+#include <sfx2/dllapi.h>
+#include <rtl/ustring.hxx>
+
+namespace com::sun::star::beans { struct StringPair; }
+namespace com::sun::star::uno { template <typename > class Reference; }
+
+namespace com::sun::star::rdf {
+    class XMetadatable;
+}
+
+namespace sfx2 {
+
+// XML ID utilities --------------------------------------------------
+
+/** is i_rIdref a valid NCName ? */
+bool SFX2_DLLPUBLIC isValidNCName(OUString const & i_rIdref);
+
+bool SFX2_DLLPUBLIC isValidXmlId(OUString const & i_rStreamName,
+    OUString const & i_rIdref);
+
+// XML ID handling ---------------------------------------------------
+
+/** interface for getElementByMetadataReference;
+    for use by sfx2::DocumentMetadataAccess
+ */
+class SFX2_DLLPUBLIC IXmlIdRegistry
+{
+
+public:
+    virtual ~IXmlIdRegistry() { }
+
+    virtual css::uno::Reference< css::rdf::XMetadatable >
+        GetElementByMetadataReference(
+            const css::beans::StringPair & i_rXmlId) const = 0;
+
+};
+
+} // namespace sfx2
+
+#endif // INCLUDED_SFX2_XMLIDREGISTRY_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */