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diff --git a/sc/source/filter/inc/commentsbuffer.hxx b/sc/source/filter/inc/commentsbuffer.hxx
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+++ b/sc/source/filter/inc/commentsbuffer.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 "richstring.hxx"
+#include "worksheethelper.hxx"
+#include <com/sun/star/awt/Rectangle.hpp>
+
+namespace oox::xls {
+
+struct CommentModel
+{
+    ScRange             maRange;            /// Position of the comment in the worksheet.
+    RichStringRef       mxText;             /// Formatted text of the comment (not used in BIFF8).
+    sal_Int32           mnAuthorId;         /// Identifier of the comment's author (OOXML and BIFF12 only).
+    bool                mbAutoFill;         /// Auto Selection of comment object's fill style
+    bool                mbAutoScale;        /// Auto Scale comment text
+    bool                mbColHidden;        /// Comment cell's Column is Hidden
+    bool                mbLocked;           /// Comment changes Locked
+    bool                mbRowHidden;        /// Comment cell's Row is Hidden
+    sal_Int32           mnTHA;              /// Horizontal Alignment
+    sal_Int32           mnTVA;              /// Vertical Alignment
+    css::awt::Rectangle maAnchor;           /// Anchor parameters
+
+    explicit            CommentModel();
+};
+
+class Comment final : public WorksheetHelper
+{
+public:
+    explicit            Comment( const WorksheetHelper& rHelper );
+
+    /** Imports a cell comment from the passed attributes of the comment element. */
+    void                importComment( const AttributeList& rAttribs );
+    /** Imports a cell comment Properties from the passed attributes of the comment element. */
+    void                importCommentPr( const AttributeList& rAttribs );
+    /** Imports a cell comment from the passed stream of a COMMENT record. */
+    void                importComment( SequenceInputStream& rStrm );
+
+    /** Creates and returns a new rich-string object for the comment text. */
+    RichStringRef const & createText();
+
+    /** Finalizes the formatted string of the comment. */
+    void                finalizeImport();
+
+private:
+    CommentModel        maModel;
+};
+
+typedef std::shared_ptr< Comment > CommentRef;
+
+class CommentsBuffer final : public WorksheetHelper
+{
+public:
+    explicit            CommentsBuffer( const WorksheetHelper& rHelper );
+
+    /** Appends a new author to the list of comment authors. */
+    void                appendAuthor( const OUString& rAuthor );
+    /** Creates and returns a new comment. */
+    CommentRef          createComment();
+
+    /** Finalizes the formatted string of all comments. */
+    void                finalizeImport();
+
+private:
+    typedef RefVector< Comment >                CommentVector;
+
+    std::vector< OUString > maAuthors;
+    CommentVector       maComments;
+};
+
+} // namespace oox::xls
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */