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diff --git a/xmlsecurity/source/framework/buffernode.hxx b/xmlsecurity/source/framework/buffernode.hxx
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+++ b/xmlsecurity/source/framework/buffernode.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.hxx>
+
+#include <memory>
+#include <vector>
+
+namespace com::sun::star::xml::wrapper
+{
+class XXMLElementWrapper;
+}
+
+class ElementMark;
+class ElementCollector;
+
+class BufferNode final
+/****** buffernode.hxx/CLASS BufferNode ***************************************
+ *
+ *   NAME
+ *  BufferNode -- Class to maintain the tree of buffered elements
+ *
+ *   FUNCTION
+ *  One BufferNode object represents a buffered element in the document
+ *  wrapper component.
+ *  All BufferNode objects construct a tree which has the same structure
+ *  of all buffered elements. That is to say, if one buffered element is
+ *  an ancestor of another buffered element, then the corresponding
+ *  BufferNode objects are also in ancestor/descendant relationship.
+ *  This class is used to manipulate the tree of buffered elements.
+ ******************************************************************************/
+{
+private:
+    /* the parent BufferNode */
+    BufferNode* m_pParent;
+
+    /* all child BufferNodes */
+    std::vector<std::unique_ptr<BufferNode>> m_vChildren;
+
+    /* all ElementCollector holding this BufferNode */
+    std::vector<const ElementCollector*> m_vElementCollectors;
+
+    /*
+     * the blocker holding this BufferNode, one BufferNode can have one
+     * blocker at most
+     */
+    ElementMark* m_pBlocker;
+
+    /*
+     * whether the element has completely buffered by the document wrapper
+     * component
+     */
+    bool m_bAllReceived;
+
+    /* the XMLElementWrapper of the buffered element */
+    css::uno::Reference<css::xml::wrapper::XXMLElementWrapper> m_xXMLElement;
+
+private:
+    bool isECInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const;
+    bool isECOfBeforeModifyInAncestorIncluded(sal_Int32 nIgnoredSecurityId) const;
+    bool isBlockerInSubTreeIncluded(sal_Int32 nIgnoredSecurityId) const;
+    const BufferNode* getNextChild(const BufferNode* pChild) const;
+
+public:
+    explicit BufferNode(css::uno::Reference<css::xml::wrapper::XXMLElementWrapper> xXMLElement);
+
+    bool isECOfBeforeModifyIncluded(sal_Int32 nIgnoredSecurityId) const;
+    void setReceivedAll();
+    bool isAllReceived() const { return m_bAllReceived; }
+    void addElementCollector(const ElementCollector* pElementCollector);
+    void removeElementCollector(const ElementCollector* pElementCollector);
+    ElementMark* getBlocker() const { return m_pBlocker; }
+    void setBlocker(const ElementMark* pBlocker);
+    OUString printChildren() const;
+    bool hasAnything() const;
+    bool hasChildren() const;
+    std::vector<std::unique_ptr<BufferNode>> const& getChildren() const;
+    std::vector<std::unique_ptr<BufferNode>> releaseChildren();
+    const BufferNode* getFirstChild() const;
+    void addChild(std::unique_ptr<BufferNode> pChild, sal_Int32 nPosition);
+    void addChild(std::unique_ptr<BufferNode> pChild);
+    void removeChild(const BufferNode* pChild);
+    sal_Int32 indexOfChild(const BufferNode* pChild) const;
+    const BufferNode* getParent() const { return m_pParent; }
+    void setParent(const BufferNode* pParent);
+    const BufferNode* getNextSibling() const;
+    const BufferNode* isAncestor(const BufferNode* pDescendant) const;
+    bool isPrevious(const BufferNode* pFollowing) const;
+    const BufferNode* getNextNodeByTreeOrder() const;
+    const css::uno::Reference<css::xml::wrapper::XXMLElementWrapper>& getXMLElement() const
+    {
+        return m_xXMLElement;
+    }
+    void
+    setXMLElement(const css::uno::Reference<css::xml::wrapper::XXMLElementWrapper>& xXMLElement);
+    void notifyBranch();
+    void elementCollectorNotify();
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */