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diff --git a/include/sax/fshelper.hxx b/include/sax/fshelper.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_SAX_FSHELPER_HXX
+#define INCLUDED_SAX_FSHELPER_HXX
+
+#include <com/sun/star/xml/sax/XFastAttributeList.hpp>
+#include <com/sun/star/uno/Reference.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <rtl/ustring.hxx>
+#include <rtl/ref.hxx>
+#include <sax/saxdllapi.h>
+#include <optional>
+#include <memory>
+#include <string_view>
+#include <utility>
+
+namespace com::sun::star::io { class XOutputStream; }
+namespace sax_fastparser { class FastAttributeList; }
+
+constexpr sal_Int32 FSNS(sal_Int32 namespc, sal_Int32 element) { return (namespc << 16) | element; }
+
+namespace sax_fastparser {
+
+enum class MergeMarks { APPEND = 0, PREPEND = 1, POSTPONE = 2};
+
+class FastSaxSerializer;
+
+class SAX_DLLPUBLIC FastSerializerHelper
+{
+public:
+
+    FastSerializerHelper( const css::uno::Reference< css::io::XOutputStream >& xOutputStream, bool bWriteHeader );
+
+    ~FastSerializerHelper();
+
+    void startDocument();
+    void endDocument();
+
+    /// Start an element. After the first argument there can be a number of (attribute, value) pairs.
+    template<typename... Args>
+    void startElement(sal_Int32 elementTokenId, sal_Int32 attribute, const char* value, Args &&... args)
+    {
+        if (value)
+            pushAttributeValue(attribute, value);
+        startElement(elementTokenId, std::forward<Args>(args)...);
+    }
+    template<typename... Args>
+    void startElement(sal_Int32 elementTokenId, sal_Int32 attribute,
+                      const std::optional<OString>& value, Args&&... args)
+    {
+        if (value)
+            pushAttributeValue(attribute, *value);
+        startElement(elementTokenId, std::forward<Args>(args)...);
+    }
+    template<typename... Args>
+    void startElement(sal_Int32 elementTokenId, sal_Int32 attribute,
+                      const std::optional<OUString>& value, Args&&... args)
+    {
+        std::optional<OString> opt;
+        if (value)
+            opt = value->toUtf8();
+        startElement(elementTokenId, attribute, opt, std::forward<Args>(args)...);
+    }
+    void startElement(sal_Int32 elementTokenId);
+
+    /// Start an element. After the first two arguments there can be a number of (attribute, value) pairs.
+    template<typename... Args>
+    void startElementNS(sal_Int32 namespaceTokenId, sal_Int32 elementTokenId, Args &&... args)
+    {
+        startElement(FSNS(namespaceTokenId, elementTokenId), std::forward<Args>(args)...);
+    }
+
+    /// Create a single element. After the first argument there can be a number of (attribute, value) pairs.
+    template<typename... Args>
+    void singleElement(sal_Int32 elementTokenId, sal_Int32 attribute, const char* value, Args &&... args)
+    {
+        if (value)
+            pushAttributeValue(attribute, value);
+        singleElement(elementTokenId, std::forward<Args>(args)...);
+    }
+    template<typename... Args>
+    void singleElement(sal_Int32 elementTokenId, sal_Int32 attribute,
+                       const std::optional<OString>& value, Args&&... args)
+    {
+        if (value)
+            pushAttributeValue(attribute, *value);
+        singleElement(elementTokenId, std::forward<Args>(args)...);
+    }
+    template<typename... Args>
+    void singleElement(sal_Int32 elementTokenId, sal_Int32 attribute,
+                       const std::optional<OUString>& value, Args&&... args)
+    {
+        std::optional<OString> opt;
+        if (value)
+            opt = value->toUtf8();
+        singleElement(elementTokenId, attribute, opt, std::forward<Args>(args)...);
+    }
+    void singleElement(sal_Int32 elementTokenId);
+
+    /// Create a single element. After the first two arguments there can be a number of (attribute, value) pairs.
+    template<typename... Args>
+    void singleElementNS(sal_Int32 namespaceTokenId, sal_Int32 elementTokenId, Args &&... args)
+    {
+        singleElement(FSNS(namespaceTokenId, elementTokenId), std::forward<Args>(args)...);
+    }
+
+    void endElement(sal_Int32 elementTokenId);
+    void endElementNS(sal_Int32 namespaceTokenId, sal_Int32 elementTokenId)
+        { endElement( FSNS( namespaceTokenId, elementTokenId ) ); }
+
+    void singleElement(sal_Int32 elementTokenId, const rtl::Reference<FastAttributeList>& xAttrList);
+
+    void startElement(sal_Int32 elementTokenId, const rtl::Reference<FastAttributeList>& xAttrList);
+
+    FastSerializerHelper* write(const char* value);
+    FastSerializerHelper* write(const OString& value);
+    FastSerializerHelper* write(std::u16string_view value);
+    FastSerializerHelper* write(sal_Int32 value);
+    FastSerializerHelper* write(sal_Int64 value);
+    FastSerializerHelper* write(double value);
+
+    FastSerializerHelper* writeEscaped(const char* value);
+    FastSerializerHelper* writeEscaped(std::u16string_view value);
+
+    FastSerializerHelper* writeId(sal_Int32 tokenId);
+
+    css::uno::Reference< css::io::XOutputStream > const & getOutputStream() const;
+
+    static rtl::Reference<FastAttributeList> createAttrList();
+
+    void mark(sal_Int32 nTag,
+            const css::uno::Sequence< sal_Int32 >& rOrder =
+            css::uno::Sequence< sal_Int32 >() );
+    void mergeTopMarks(sal_Int32 nTag,
+            MergeMarks eMergeType = MergeMarks::APPEND );
+
+    void setAllowXEscape(bool bSet);
+
+private:
+    void pushAttributeValue( sal_Int32 attribute, const char* value );
+    void pushAttributeValue( sal_Int32 attribute, const OString& value );
+
+    std::unique_ptr<FastSaxSerializer> mpSerializer;
+};
+
+typedef std::shared_ptr< FastSerializerHelper > FSHelperPtr;
+
+// Helpers to make intention to pass optional attributes to *Element functions explicit, instead of
+// using `(condition) ? value.toUtf8().getStr() : nullptr` syntax.
+inline const char* UseIf(const char* s, bool bUse) { return bUse ? s : nullptr; }
+// OString, OUString
+template<class TString>
+std::optional<TString> UseIf(const TString& s, bool bUse)
+{
+    return bUse ? std::optional<TString>(s) : std::optional<TString>();
+}
+
+}
+
+#endif // INCLUDED_SAX_FSHELPER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */