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diff --git a/include/oox/core/relations.hxx b/include/oox/core/relations.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_OOX_CORE_RELATIONS_HXX
+#define INCLUDED_OOX_CORE_RELATIONS_HXX
+
+#include <cstddef>
+#include <map>
+#include <memory>
+#include <string_view>
+
+#include <oox/dllapi.h>
+#include <rtl/ustring.hxx>
+
+namespace oox::core {
+
+
+/** Expands to an OUString containing an 'officeDocument' transitional relation type created
+    from the passed literal(!) ASCII(!) character array. */
+#define CREATE_OFFICEDOC_RELATION_TYPE( ascii ) \
+    ( u"http://schemas.openxmlformats.org/officeDocument/2006/relationships/" ascii )
+
+/** Expands to an OUString containing an 'officeDocument' strict relation type created
+    from the passed literal(!) ASCII(!) character array. */
+#define CREATE_OFFICEDOC_RELATION_TYPE_STRICT( ascii ) \
+    ( "http://purl.oclc.org/ooxml/officeDocument/relationships/" ascii )
+
+/** Expands to an OUString containing an MS Office specific relation type
+    created from the passed literal(!) ASCII(!) character array. */
+#define CREATE_MSOFFICE_RELATION_TYPE( ascii ) \
+    ( u"http://schemas.microsoft.com/office/2006/relationships/" ascii )
+
+#define CREATE_XL_CONTENT_TYPE( ascii ) \
+    ( "application/vnd.openxmlformats-officedocument.spreadsheetml." ascii "+xml" )
+
+struct Relation
+{
+    OUString     maId;
+    OUString     maType;
+    OUString     maTarget;
+    bool                mbExternal;
+
+    Relation() : mbExternal( false ) {}
+};
+
+
+class Relations;
+typedef std::shared_ptr< Relations > RelationsRef;
+
+class OOX_DLLPUBLIC Relations
+{
+public:
+    explicit            Relations( const OUString& rFragmentPath );
+
+    size_t size() const { return maMap.size(); }
+    size_t count( const OUString& rId ) const { return maMap.count( rId ); }
+    ::std::map< OUString, Relation >::const_iterator begin() const
+    {
+        return maMap.begin();
+    }
+    ::std::map< OUString, Relation >::const_iterator end() const
+    {
+        return maMap.end();
+    }
+    template<class... Args>
+    void emplace(Args&&... args)
+    {
+        maMap.emplace(std::forward<Args>(args)...);
+    }
+
+    /** Returns the path of the fragment this relations collection is related to. */
+    const OUString& getFragmentPath() const { return maFragmentPath; }
+
+    /** Returns the relation with the passed relation identifier. */
+    const Relation*     getRelationFromRelId( const OUString& rId ) const;
+    /** Returns the first relation with the passed type. */
+    const Relation*     getRelationFromFirstType( std::u16string_view rType ) const;
+    /** Finds all relations associated with the passed type. */
+    RelationsRef        getRelationsFromTypeFromOfficeDoc( std::u16string_view rType ) const;
+
+    /** Returns the external target of the relation with the passed relation identifier. */
+    OUString     getExternalTargetFromRelId( const OUString& rRelId ) const;
+    /** Returns the internal target of the relation with the passed relation identifier. */
+    OUString     getInternalTargetFromRelId( const OUString& rRelId ) const;
+
+    /** Returns the full fragment path for the target of the passed relation. */
+    OUString     getFragmentPathFromRelation( const Relation& rRelation ) const;
+    /** Returns the full fragment path for the passed relation identifier. */
+    OUString     getFragmentPathFromRelId( const OUString& rRelId ) const;
+    /** Returns the full fragment path for the first relation of the passed type. */
+    OUString     getFragmentPathFromFirstType( std::u16string_view rType ) const;
+    OUString     getFragmentPathFromFirstTypeFromOfficeDoc( std::u16string_view rType ) const;
+
+private:
+    ::std::map< OUString, Relation > maMap;
+    OUString     maFragmentPath;
+};
+
+
+} // namespace oox::core
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */