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diff --git a/xmlsecurity/source/helper/xsecparser.hxx b/xmlsecurity/source/helper/xsecparser.hxx
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+++ b/xmlsecurity/source/helper/xsecparser.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/lang/XInitialization.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+
+#include <cppuhelper/implbase.hxx>
+
+#include <xmloff/namespacemap.hxx>
+
+#include <memory>
+#include <optional>
+#include <stack>
+
+class XMLSignatureHelper;
+class XSecController;
+
+class XSecParser: public cppu::WeakImplHelper
+<
+    css::xml::sax::XDocumentHandler,
+    css::lang::XInitialization
+>
+/****** XSecController.hxx/CLASS XSecParser ***********************************
+ *
+ *   NAME
+ *  XSecParser -- a SAX parser that can detect security elements
+ *
+ *   FUNCTION
+ *  The XSecParser object is connected on the SAX chain and detects
+ *  security elements in the SAX event stream, then notifies
+ *  the XSecController.
+ *
+ *   NOTES
+ *  This class is used when importing a document.
+ ******************************************************************************/
+{
+    friend class XSecController;
+public:
+    class Context;
+private:
+    class UnknownContext;
+    class ReferencedContextImpl;
+    class LoPGPOwnerContext;
+    class DsPGPKeyPacketContext;
+    class DsPGPKeyIDContext;
+    class DsPGPDataContext;
+    class DsX509CertificateContext;
+    class DsX509SerialNumberContext;
+    class DsX509IssuerNameContext;
+    class DsX509IssuerSerialContext;
+    class DsX509DataContext;
+    class DsKeyInfoContext;
+    class DsSignatureValueContext;
+    class DsDigestValueContext;
+    class DsDigestMethodContext;
+    class DsTransformContext;
+    class DsTransformsContext;
+    class DsReferenceContext;
+    class DsSignatureMethodContext;
+    class DsSignedInfoContext;
+    class XadesEncapsulatedX509CertificateContext;
+    class XadesCertificateValuesContext;
+    class XadesUnsignedSignaturePropertiesContext;
+    class XadesUnsignedPropertiesContext;
+    class LoSignatureLineIdContext;
+    class LoSignatureLineValidImageContext;
+    class LoSignatureLineInvalidImageContext;
+    class LoSignatureLineContext;
+    class XadesCertDigestContext;
+    class XadesCertContext;
+    class XadesSigningCertificateContext;
+    class XadesSigningTimeContext;
+    class XadesSignedSignaturePropertiesContext;
+    class XadesSignedPropertiesContext;
+    class XadesQualifyingPropertiesContext;
+    class DcDateContext;
+    class DcDescriptionContext;
+    class DsSignaturePropertyContext;
+    class DsSignaturePropertiesContext;
+    class DsObjectContext;
+    class DsSignatureContext;
+    class DsigSignaturesContext;
+
+    std::stack<std::unique_ptr<Context>> m_ContextStack;
+    std::optional<SvXMLNamespaceMap> m_pNamespaceMap;
+
+    /*
+     * the XSecController collaborating with XSecParser
+     */
+    XSecController* m_pXSecController;
+
+    /*
+     * the next XDocumentHandler on the SAX chain
+     */
+    css::uno::Reference<
+        css::xml::sax::XDocumentHandler > m_xNextHandler;
+
+    XMLSignatureHelper& m_rXMLSignatureHelper;
+
+    OUString HandleIdAttr(css::uno::Reference<css::xml::sax::XAttributeList> const& xAttrs);
+    static OUString getIdAttr(const css::uno::Reference<
+            css::xml::sax::XAttributeList >& xAttribs );
+
+public:
+    XSecParser(XMLSignatureHelper& rXMLSignatureHelper, XSecController* pXSecController);
+
+    /*
+     * XDocumentHandler
+     */
+    virtual void SAL_CALL startDocument(  ) override;
+
+    virtual void SAL_CALL endDocument(  ) override;
+
+    virtual void SAL_CALL startElement(
+        const OUString& aName,
+        const css::uno::Reference<
+            css::xml::sax::XAttributeList >& xAttribs ) override;
+
+    virtual void SAL_CALL endElement( const OUString& aName ) override;
+
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
+    virtual void SAL_CALL ignorableWhitespace( const OUString& aWhitespaces ) override;
+
+    virtual void SAL_CALL processingInstruction(
+        const OUString& aTarget,
+        const OUString& aData ) override;
+
+    virtual void SAL_CALL setDocumentLocator(
+        const css::uno::Reference<
+            css::xml::sax::XLocator >& xLocator ) override;
+
+    /*
+     * XInitialization
+     */
+    virtual void SAL_CALL initialize(
+        const css::uno::Sequence< css::uno::Any >& aArguments ) override;
+};
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */