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diff --git a/xmlsecurity/source/framework/elementcollector.hxx b/xmlsecurity/source/framework/elementcollector.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_XMLSECURITY_SOURCE_FRAMEWORK_ELEMENTCOLLECTOR_HXX
+#define INCLUDED_XMLSECURITY_SOURCE_FRAMEWORK_ELEMENTCOLLECTOR_HXX
+
+#include "elementmark.hxx"
+#include <com/sun/star/xml/crypto/sax/ElementMarkPriority.hpp>
+#include <com/sun/star/uno/Reference.hxx>
+
+namespace com::sun::star::xml::crypto::sax { class XReferenceResolvedListener; }
+
+class ElementCollector : public ElementMark
+/****** elementcollector.hxx/CLASS ElementCollector ***************************
+ *
+ *   NAME
+ *  ElementCollector -- Class to manipulate an element collector
+ *
+ *   FUNCTION
+ *  This class is derived from the ElementMark class. Beyond the function
+ *  of the ElementMark class, this class also maintains the priority, and
+ *  manages the notify process
+ ******************************************************************************/
+{
+private:
+    /*
+     * the notify priority, is one of following values:
+     * AFTERMODIFY  - this ElementCollector will notify after all
+     *                    internal modifications have finished.
+     * BEFOREMODIFY - this ElementCollector must notify before any
+     *                    internal modification happens.
+     */
+    css::xml::crypto::sax::ElementMarkPriority const m_nPriority;
+
+    /*
+     * the modify flag, representing whether which elementcollector will
+     * modify its data.
+     */
+    bool const m_bToModify;
+
+    /* the notify enable flag, see notifyListener method */
+    bool m_bAbleToNotify;
+
+    /* whether the listener has been notified */
+    bool m_bNotified;
+
+    /* the listener to be notified */
+    css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener > m_xReferenceResolvedListener;
+
+public:
+    ElementCollector(
+        sal_Int32 nBufferId,
+        css::xml::crypto::sax::ElementMarkPriority nPriority,
+        bool bToModify,
+        const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& xReferenceResolvedListener);
+
+    css::xml::crypto::sax::ElementMarkPriority getPriority() const { return m_nPriority;}
+    bool getModify() const { return m_bToModify;}
+    void notifyListener();
+    void setReferenceResolvedListener(
+        const css::uno::Reference< css::xml::crypto::sax::XReferenceResolvedListener >& referenceResolvedListener);
+    void doNotify();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */