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diff --git a/xmloff/source/text/XMLRedlineExport.hxx b/xmloff/source/text/XMLRedlineExport.hxx
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+++ b/xmloff/source/text/XMLRedlineExport.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 .
+ */
+
+#pragma once
+
+#include <com/sun/star/uno/Reference.h>
+#include <com/sun/star/uno/Sequence.h>
+
+#include <vector>
+#include <memory>
+#include <map>
+
+class SvXMLExport;
+namespace com::sun::star {
+    namespace beans { class XPropertySet; }
+    namespace beans { struct PropertyValue; }
+    namespace text { class XText; }
+    namespace text { class XTextContent; }
+    namespace text { class XTextSection; }
+}
+
+// store a list of redline properties
+typedef ::std::vector<
+            css::uno::Reference<css::beans::XPropertySet> > ChangesVectorType;
+
+// store a list of redline properties for each XText
+typedef ::std::map<
+            css::uno::Reference< css::text::XText>,
+            std::unique_ptr<ChangesVectorType> > ChangesMapType;
+
+
+/**
+ * This class handles the export of redline portions.
+ * It is to be called from XMLTextParagraphExport.
+ */
+class XMLRedlineExport
+{
+    const OUString sDeletion;
+    const OUString sFormatChange;
+    const OUString sInsertion;
+
+    SvXMLExport& rExport;
+
+
+    // handling of change recording:
+
+    // To support change tracking in headers and footers we need to
+    // write these changes separately. To do this, we record the
+    // changes for headers and footers. For the main document body, we
+    // get the complete list of changes from the document, which
+    // should be much more efficient than recording all of those.
+
+    ChangesMapType aChangeMap;              /// map of recorded changes
+
+    /// list of current changes; is NULL or points to member of aChangeMap
+    ChangesVectorType* pCurrentChangesList;
+
+
+public:
+    explicit XMLRedlineExport(SvXMLExport& rExp);
+
+    ~XMLRedlineExport();
+
+    /// export a change
+    void ExportChange(
+        /// PropertySet of RedlinePortion
+        const css::uno::Reference<css::beans::XPropertySet> & rPropSet,
+        bool bAutoStyle);
+
+    /// export the list of changes (complete list minus recorded changed)
+    void ExportChangesList(bool bAutoStyles);
+
+    /// export the list of changes (recorded changes for this XText only)
+    void ExportChangesList(
+        const css::uno::Reference<css::text::XText> & rText,
+        bool bAutoStyles);
+
+    /// set the current XText for which changes should be recorded.
+    /// An empty XText means: don't record changes
+    void SetCurrentXText(
+        const css::uno::Reference<css::text::XText> & rText);
+
+    /// Do not record changes.
+    /// Same as SetCurrentXText(Reference<XText>) with empty argument.
+    void SetCurrentXText();
+
+    /// export redline marks which start or end at start nodes,
+    /// i.e. that include the complete paragraph/table/section
+    void ExportStartOrEndRedline(
+        const css::uno::Reference<
+                    css::beans::XPropertySet> & rPropSet,
+        bool bStart);   /// start or end of text entity (e.g. paragraph)?
+
+    /// convenience method, calls XPropertySet-version of this method
+    void ExportStartOrEndRedline(
+        /// XTextContent; must also be an XPropertySet
+        const css::uno::Reference<css::text::XTextContent> & rContent,
+        bool bStart);
+
+    /// convenience method, calls XPropertySet-version of this method
+    void ExportStartOrEndRedline(
+        /// XTextSection; must also be an XPropertySet
+        const css::uno::Reference<css::text::XTextSection> & rSection,
+        bool bStart);
+
+private:
+
+    /// export the change mark contained in the text body
+    void ExportChangeInline(
+        /// PropertySet of RedlinePortion
+        const css::uno::Reference<css::beans::XPropertySet> & rPropSet);
+
+    /// export the auto styles used in this change
+    void ExportChangeAutoStyle(
+        /// PropertySet of RedlinePortion
+        const css::uno::Reference<css::beans::XPropertySet> & rPropSet);
+
+    /// export the changes list (<text:tracked-changes>)
+    void ExportChangesListElements();
+
+    /// export the auto styles needed by the changes list
+    void ExportChangesListAutoStyles();
+
+    /// export the changed-region element
+    void ExportChangedRegion(
+        const css::uno::Reference<css::beans::XPropertySet> & rPropSet);
+
+    /// export a change-info element (from a PropertySet)
+    void ExportChangeInfo(
+        const css::uno::Reference<css::beans::XPropertySet> & rPropSet);
+
+    /// export a change-info element (from PropertyValues)
+    void ExportChangeInfo(
+        const css::uno::Sequence<css::beans::PropertyValue> & rValues);
+
+    /// convert the change type from API to XML names
+    OUString const & ConvertTypeName(std::u16string_view sApiName);
+
+    /// Get ID string!
+    static OUString GetRedlineID(
+        const css::uno::Reference<css::beans::XPropertySet> & rPropSet);
+
+    /// write a comment string as sequence of <text:p> elements
+    void WriteComment(std::u16string_view rComment);
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */