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diff --git a/include/unotools/accessiblerelationsethelper.hxx b/include/unotools/accessiblerelationsethelper.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_UNOTOOLS_ACCESSIBLERELATIONSETHELPER_HXX
+#define INCLUDED_UNOTOOLS_ACCESSIBLERELATIONSETHELPER_HXX
+
+#include <unotools/unotoolsdllapi.h>
+
+#include <com/sun/star/accessibility/XAccessibleRelationSet.hpp>
+#include <osl/mutex.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <memory>
+
+class AccessibleRelationSetHelperImpl;
+
+//= XAccessibleRelationSet helper classes
+
+//... namespace utl .......................................................
+namespace utl
+{
+
+/** @descr
+        This base class provides an implementation of the
+        <code>AccessibleRelationSet</code> service.
+*/
+class UNOTOOLS_DLLPUBLIC AccessibleRelationSetHelper final
+    :   public cppu::WeakImplHelper< css::accessibility::XAccessibleRelationSet >
+{
+public:
+    //=====  internal  ========================================================
+    AccessibleRelationSetHelper ();
+    AccessibleRelationSetHelper (const AccessibleRelationSetHelper& rHelper);
+private:
+    virtual ~AccessibleRelationSetHelper() override;
+public:
+
+    //=====  XAccessibleRelationSet  ==========================================
+
+    /** Returns the number of relations in this relation set.
+
+        @return
+            Returns the number of relations or zero if there are none.
+    */
+    virtual sal_Int32 SAL_CALL getRelationCount(  ) override;
+
+    /** Returns the relation of this relation set that is specified by
+        the given index.
+
+        @param nIndex
+            This index specifies the relatio to return.
+
+        @return
+            For a valid index, i.e. inside the range 0 to the number of
+            relations minus one, the returned value is the requested
+            relation.  If the index is invalid then the returned relation
+            has the type INVALID.
+
+    */
+    virtual css::accessibility::AccessibleRelation SAL_CALL
+        getRelation( sal_Int32 nIndex ) override;
+
+    /** Tests whether the relation set contains a relation matching the
+        specified key.
+
+        @param aRelationType
+            The type of relation to look for in this set of relations.  This
+            has to be one of the constants of
+            AccessibleRelationType.
+
+        @return
+            Returns <TRUE/> if there is a (at least one) relation of the
+            given type and <FALSE/> if there is no such relation in the set.
+    */
+    virtual sal_Bool SAL_CALL containsRelation( sal_Int16 aRelationType ) override;
+
+    /** Retrieve and return the relation with the given relation type.
+
+        @param aRelationType
+            The type of the relation to return.  This has to be one of the
+            constants of AccessibleRelationType.
+
+        @return
+            If a relation with the given type could be found than (a copy
+            of) this relation is returned.  Otherwise a relation with the
+            type INVALID is returned.
+    */
+    virtual css::accessibility::AccessibleRelation SAL_CALL
+        getRelationByType( sal_Int16 aRelationType ) override;
+
+    /// @throws uno::RuntimeException
+    void AddRelation(
+        const css::accessibility::AccessibleRelation& rRelation);
+
+    //=====  XTypeProvider  ===================================================
+
+    /** Returns a sequence of all supported interfaces.
+    */
+    virtual css::uno::Sequence< css::uno::Type> SAL_CALL
+        getTypes() override;
+
+    /** Returns an implementation id.
+    */
+    virtual css::uno::Sequence<sal_Int8> SAL_CALL
+        getImplementationId() override;
+
+private:
+    /// Mutex guarding this object.
+    ::osl::Mutex maMutex;
+    /// The implementation of this helper interface.
+    std::unique_ptr<AccessibleRelationSetHelperImpl>    mpHelperImpl;
+};
+
+}
+//... namespace utl .......................................................
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */