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diff --git a/include/comphelper/ofopxmlhelper.hxx b/include/comphelper/ofopxmlhelper.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_COMPHELPER_OFOPXMLHELPER_HXX
+#define INCLUDED_COMPHELPER_OFOPXMLHELPER_HXX
+
+#include <sal/config.h>
+
+#include <string_view>
+
+#include <com/sun/star/uno/Sequence.h>
+
+#include <comphelper/comphelperdllapi.h>
+
+namespace com::sun::star::beans { struct StringPair; }
+namespace com::sun::star::io { class XInputStream; }
+namespace com::sun::star::io { class XOutputStream; }
+namespace com::sun::star::uno { class XComponentContext; }
+namespace com::sun::star::uno { template <class interface_type> class Reference; }
+
+namespace comphelper::OFOPXMLHelper {
+
+    // returns sequence of elements, where each element is described by sequence of tags,
+    // where each tag is described by StringPair ( First - name, Second - value )
+    // the first tag of each element sequence must be "Id"
+    /// @throws css::uno::Exception
+    COMPHELPER_DLLPUBLIC
+    css::uno::Sequence< css::uno::Sequence< css::beans::StringPair > >
+    ReadRelationsInfoSequence(
+        const css::uno::Reference< css::io::XInputStream >& xInStream,
+        std::u16string_view aStreamName,
+        const css::uno::Reference< css::uno::XComponentContext >& rContext );
+
+    // returns sequence containing two entries of type sequence<StringPair>
+    // the first sequence describes "Default" elements, where each element is described
+    // by StringPair object ( First - Extension, Second - ContentType )
+    // the second sequence describes "Override" elements, where each element is described
+    // by StringPair object ( First - PartName, Second - ContentType )
+    /// @throws css::uno::Exception
+    COMPHELPER_DLLPUBLIC
+    css::uno::Sequence< css::uno::Sequence< css::beans::StringPair > >
+    ReadContentTypeSequence(
+        const css::uno::Reference< css::io::XInputStream >& xInStream,
+        const css::uno::Reference< css::uno::XComponentContext >& rContext );
+
+    // returns the ContentType for the given name, or empty when not found.
+    // rContentTypes is a sequence containing two entries of type sequence<StringPair>
+    // the first sequence describes "Default" elements, where each element is described
+    // by StringPair object ( First - Extension, Second - ContentType )
+    // the second sequence describes "Override" elements, where each element is described
+    // by StringPair object ( First - PartName, Second - ContentType )
+    // The "Override" sequence is searched first before falling back on "Default".
+    COMPHELPER_DLLPUBLIC
+    OUString
+    GetContentTypeByName(const css::uno::Sequence<css::uno::Sequence<css::beans::StringPair>>& rContentTypes,
+                         const OUString& rFilename);
+
+    // writes sequence of elements, where each element is described by sequence of tags,
+    // where each tag is described by StringPair ( First - name, Second - value )
+    // the first tag of each element sequence must be "Id"
+    /// @throws css::uno::Exception
+    COMPHELPER_DLLPUBLIC
+    void WriteRelationsInfoSequence(
+        const css::uno::Reference< css::io::XOutputStream >& xOutStream,
+        const css::uno::Sequence< css::uno::Sequence< css::beans::StringPair > >& aSequence,
+        const css::uno::Reference< css::uno::XComponentContext >& rContext );
+
+    // writes two entries of type sequence<StringPair>
+    // the first sequence describes "Default" elements, where each element is described
+    // by StringPair object ( First - Extension, Second - ContentType )
+    // the second sequence describes "Override" elements, where each element is described
+    // by StringPair object ( First - PartName, Second - ContentType )
+    /// @throws css::uno::Exception
+    COMPHELPER_DLLPUBLIC
+    void WriteContentSequence(
+        const css::uno::Reference< css::io::XOutputStream >& xOutStream,
+        const css::uno::Sequence< css::beans::StringPair >& aDefaultsSequence,
+        const css::uno::Sequence< css::beans::StringPair >& aOverridesSequence,
+        const css::uno::Reference< css::uno::XComponentContext >& rContext );
+
+} // namespace comphelper::OFOPXMLHelper
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */