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diff --git a/l10ntools/inc/helper.hxx b/l10ntools/inc/helper.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/.
+ */
+
+// Helper string methods
+
+#ifndef INCLUDED_L10NTOOLS_INC_HELPER_HXX
+#define INCLUDED_L10NTOOLS_INC_HELPER_HXX
+
+#include <sal/config.h>
+
+#include <string_view>
+
+#include <libxml/xmlstring.h>
+
+#include <rtl/string.hxx>
+
+
+namespace helper {
+
+/// Escape all given character in the text
+OString escapeAll(
+    std::string_view rText, std::string_view rUnEscaped, std::string_view rEscaped );
+/// Unescape all given character in the text
+OString unEscapeAll(
+    std::string_view rText, std::string_view rEscaped, std::string_view rUnEscaped  );
+
+/// Convert special characters to XML entity references
+OString QuotHTML( std::string_view rString );
+/// Convert XML entity references to single characters
+OString UnQuotHTML( std::string_view rString );
+
+/// Check whether text is a valid XML expression
+bool isWellFormedXML( std::string_view text );
+
+/// Convert xmlChar* to OString
+OString xmlStrToOString( const xmlChar* pString );
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */