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diff --git a/sd/source/ui/sidebar/DocumentHelper.hxx b/sd/source/ui/sidebar/DocumentHelper.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_SD_SOURCE_UI_SIDEBAR_DOCUMENTHELPER_HXX
+#define INCLUDED_SD_SOURCE_UI_SIDEBAR_DOCUMENTHELPER_HXX
+
+#include <rtl/ustring.hxx>
+#include <memory>
+#include <vector>
+
+class SdDrawDocument;
+class SdPage;
+
+namespace sd::sidebar {
+
+/** A collection of methods supporting the handling of master pages.
+*/
+class DocumentHelper
+{
+public:
+    /** Return a copy of the given master page in the given document.
+    */
+    static SdPage* CopyMasterPageToLocalDocument (
+        SdDrawDocument& rTargetDocument,
+        SdPage* pMasterPage);
+
+    /** Return and, when not yet present, create a slide that uses the given
+        master page.
+    */
+    static SdPage* GetSlideForMasterPage (SdPage const * pMasterPage);
+
+    /** Copy the styles used by the given page from the source document to
+        the target document.
+    */
+    static void ProvideStyles (
+        SdDrawDocument const & rSourceDocument,
+        SdDrawDocument& rTargetDocument,
+        SdPage const * pPage);
+
+    /** Assign the given master page to the list of pages.
+        @param rTargetDocument
+            The document that is the owner of the pages in rPageList.
+        @param pMasterPage
+            This master page will usually be a member of the list of all
+            available master pages as provided by the MasterPageContainer.
+        @param rPageList
+            The pages to which to assign the master page.  These pages may
+            be slides or master pages themselves.
+    */
+    static void AssignMasterPageToPageList (
+        SdDrawDocument& rTargetDocument,
+        SdPage* pMasterPage,
+        const std::shared_ptr<std::vector<SdPage*> >& rPageList);
+
+private:
+    static SdPage* AddMasterPage (
+        SdDrawDocument& rTargetDocument,
+        SdPage const * pMasterPage);
+    static SdPage* AddMasterPage (
+        SdDrawDocument& rTargetDocument,
+        SdPage const * pMasterPage,
+        sal_uInt16 nInsertionIndex);
+    static SdPage* ProvideMasterPage (
+        SdDrawDocument& rTargetDocument,
+        SdPage* pMasterPage,
+        const std::shared_ptr<std::vector<SdPage*> >& rpPageList);
+
+    /** Assign the given master page to the given page.
+        @param pMasterPage
+            In contrast to AssignMasterPageToPageList() this page is assumed
+            to be in the target document, i.e. the same document that pPage
+            is in.  The caller will usually call AddMasterPage() to create a
+            clone of a master page in another document to create it.
+        @param rsBaseLayoutName
+            The layout name of the given master page.  It is given so that
+            it has not to be created on every call.  It could be generated
+            from the given master page, though.
+        @param pPage
+            The page to which to assign the master page.  It can be a slide
+            or a master page itself.
+    */
+    static void AssignMasterPageToPage (
+        SdPage const * pMasterPage,
+        const OUString& rsBaseLayoutName,
+        SdPage* pPage);
+};
+
+} // end of namespace sd::sidebar
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */