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diff --git a/include/sfx2/Metadatable.hxx b/include/sfx2/Metadatable.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_METADATABLE_HXX
+#define INCLUDED_SFX2_METADATABLE_HXX
+
+#include <sal/config.h>
+
+#include <sfx2/dllapi.h>
+
+#include <cppuhelper/implbase.hxx>
+#include <com/sun/star/rdf/XMetadatable.hpp>
+
+#include <memory>
+
+
+namespace com::sun::star {
+    namespace frame { class XModel; }
+}
+
+namespace sfx2 {
+    class IXmlIdRegistry;
+}
+
+namespace sfx2 {
+
+class XmlIdRegistry;
+class MetadatableUndo;
+
+
+// XML ID handling ---------------------------------------------------
+
+
+/// create a sfx2::XmlIdRegistryDocument or a sfx2::XmlIdRegistryClipboard
+SFX2_DLLPUBLIC ::sfx2::IXmlIdRegistry *
+createXmlIdRegistry(const bool i_DocIsClipboard);
+
+
+/** base class for core objects that may have xml:id.
+
+    <p>The interface of this class consists of 3 parts:
+    <ul><li>implementations that are used by the MetadatableMixin
+            below</li>
+        <li>hooks to be called by the sw core whenever actions that are
+            relevant to the uniqueness of xml:ids are taken (copying,
+            splitting, merging, deletion, undo, etc.)</li>
+        <li>abstract methods that are called by the implementation of the
+            previous hooks</li></ul>
+    </p>
+ */
+class SFX2_DLLPUBLIC SAL_LOPLUGIN_ANNOTATE("crosscast") Metadatable
+{
+public:
+    Metadatable() : m_pReg(nullptr) {}
+
+    // destructor calls RemoveMetadataReference
+    virtual ~Metadatable();
+
+    // for MetadatableMixin ----------------------------------------------
+
+    css::beans::StringPair GetMetadataReference() const;
+    void SetMetadataReference( const css::beans::StringPair & i_rReference);
+    void EnsureMetadataReference();
+
+    // hooks -------------------------------------------------------------
+
+    // called from dtor!
+    void RemoveMetadataReference();
+
+    /** register this as a copy of i_rSource */
+    void RegisterAsCopyOf(Metadatable const & i_rSource,
+        const bool i_bCopyPrecedesSource = false);
+
+    /** create an Undo Metadatable, which remembers this' reference */
+    std::shared_ptr<MetadatableUndo> CreateUndo() const;
+    std::shared_ptr<MetadatableUndo> CreateUndoForDelete();
+
+    /** restore this from Undo Metadatable */
+    void RestoreMetadata(std::shared_ptr<MetadatableUndo> const& i_pUndo);
+
+    /** merge this and i_rOther into this */
+    void JoinMetadatable(Metadatable const & i_rOther,
+        const bool i_isMergedEmpty, const bool i_isOtherEmpty);
+
+    // abstract methods --------------------------------------------------
+
+    /** get the registry from the SwDoc */
+    virtual ::sfx2::IXmlIdRegistry& GetRegistry() = 0;
+
+    /** is this in a clipboard document? */
+    virtual bool IsInClipboard() const = 0;
+
+    /** is this in undo array? */
+    virtual bool IsInUndo() const = 0;
+
+    /** which stream is this in? true: content.xml; false: styles.xml */
+    virtual bool IsInContent() const = 0;
+
+    /** create XMetadatable from this.
+        note: if IsInUndo or IsInClipboard return true,
+        MakeUnoObject <em>must not</em> be called!
+     */
+    virtual css::uno::Reference< css::rdf::XMetadatable > MakeUnoObject() = 0;
+
+private:
+    Metadatable(const Metadatable&) = delete;
+    Metadatable& operator=(const Metadatable&) = delete;
+
+    friend class MetadatableClipboard;
+    friend class MetadatableUndo;
+
+    // note that Reg may be a XmlIdRegistryDocument or a XmlIdRegistryClipboard
+    XmlIdRegistry* m_pReg; // null => no XmlId
+};
+
+
+/** base class for UNO objects that implement XMetadatable.
+
+    <p>An instance of this base class is associated with an instance of
+       Metadatable.</p>
+ */
+class SFX2_DLLPUBLIC MetadatableMixin :
+    public cppu::WeakImplHelper<css::rdf::XMetadatable>
+{
+
+public:
+    MetadatableMixin() {};
+
+    // css::rdf::XNode:
+    virtual OUString SAL_CALL getStringValue() override;
+
+    // css::rdf::XURI:
+    virtual OUString SAL_CALL getLocalName() override;
+    virtual OUString SAL_CALL getNamespace() override;
+
+    // css::rdf::XMetadatable:
+    virtual css::beans::StringPair SAL_CALL getMetadataReference() override;
+    virtual void SAL_CALL setMetadataReference(
+        const css::beans::StringPair & i_rReference) override;
+    virtual void SAL_CALL ensureMetadataReference() override;
+
+protected:
+    /// get the core object corresponding to this UNO object.
+    virtual Metadatable * GetCoreObject() = 0;
+    /// get the XModel for the document
+    virtual css::uno::Reference< css::frame::XModel >
+        GetModel() = 0;
+
+};
+
+} // namespace sfx2
+
+#endif // INCLUDED_SFX2_METADATABLE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */