Moving XSAXDocumentBuilder2 to use XFastDocumentHandler:

This is used in parsing of meta Contexts across different
modules. This also involved moving to XFastParser for
parsing xml filters in sw, sd, starmath.

Change-Id: Ic663aaac6cb20ee8ce5b97cae87c93220f5a2929
Reviewed-on: https://gerrit.libreoffice.org/42989
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Jenkins <ci@libreoffice.org>

33 files changed, 637 insertions, 474 deletions

diff --git a/include/xmloff/xmlimp.hxx b/include/xmloff/xmlimp.hxx
index 364411681aa8..77b620a3f1df 100644
--- a/include/xmloff/xmlimp.hxx
+++ b/include/xmloff/xmlimp.hxx
@@ -55,6 +55,8 @@
 #include <xmloff/formlayerimport.hxx>
 #include <comphelper/attributelist.hxx>
 #include <sax/fastattribs.hxx>
+#include <rtl/ustring.hxx>
+#include <unordered_map>
 
 #include <com/sun/star/beans/NamedValue.hpp>
 
@@ -225,6 +227,7 @@ class XMLOFF_DLLPUBLIC SvXMLImport : public cppu::WeakImplHelper<
     css::uno::Reference< css::xml::sax::XFastDocumentHandler > mxFastDocumentHandler;
     static css::uno::Reference< css::xml::sax::XFastTokenHandler > xTokenHandler;
     static std::unordered_map< sal_Int32, std::pair< OUString, OUString > > aNamespaceMap;
+    static std::unordered_map< OUString, OUString, OUStringHash > aNamespaceURIPrefixMap;
     static bool bIsNSMapsInitialized;
 
     static void initializeNamespaceMaps();
@@ -378,6 +381,8 @@ public:
 
     static const OUString getNameFromToken( sal_Int32 nToken );
     static const OUString getNamespacePrefixFromToken( sal_Int32 nToken );
+    static const OUString getNamespaceURIFromToken( sal_Int32 nToken );
+    static const OUString getNamespacePrefixFromURI( const OUString& rURI );
 
     SvXMLNamespaceMap& GetNamespaceMap() { return *mpNamespaceMap; }
     const SvXMLNamespaceMap& GetNamespaceMap() const { return *mpNamespaceMap; }
diff --git a/include/xmloff/xmlmetai.hxx b/include/xmloff/xmlmetai.hxx
index 2b9160251bc0..9b9f59da7f10 100644
--- a/include/xmloff/xmlmetai.hxx
+++ b/include/xmloff/xmlmetai.hxx
@@ -40,22 +40,20 @@ private:
     css::uno::Reference< css::xml::dom::XSAXDocumentBuilder2> mxDocBuilder;
 
 public:
-    SvXMLMetaDocumentContext(SvXMLImport& rImport, sal_uInt16 nPrfx,
-        const OUString& rLName,
-        const css::uno::Reference< css::document::XDocumentProperties>& xDocProps);
-
     SvXMLMetaDocumentContext(SvXMLImport& rImport,
         const css::uno::Reference< css::document::XDocumentProperties>& xDocProps);
 
     virtual ~SvXMLMetaDocumentContext() override;
 
-    virtual SvXMLImportContextRef CreateChildContext( sal_uInt16 nPrefix,
-        const OUString& rLocalName,
-        const css::uno::Reference< css::xml::sax::XAttributeList>& xAttrList ) override;
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
+    virtual void SAL_CALL startFastElement( sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
-    virtual void StartElement( const css::uno::Reference< css::xml::sax::XAttributeList >& xAttrList ) override;
+    virtual void SAL_CALL endFastElement( sal_Int32 nElement ) override;
 
-    virtual void EndElement() override;
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
 public:
     static void setBuildId(const OUString & rGenerator,
diff --git a/offapi/com/sun/star/xml/dom/XSAXDocumentBuilder2.idl b/offapi/com/sun/star/xml/dom/XSAXDocumentBuilder2.idl
index be151460b109..37560fd8dc6f 100644
--- a/offapi/com/sun/star/xml/dom/XSAXDocumentBuilder2.idl
+++ b/offapi/com/sun/star/xml/dom/XSAXDocumentBuilder2.idl
@@ -20,7 +20,7 @@
 #ifndef __com_sun_star_xml_dom_XSAXDocumentBuilder2_idl
 #define __com_sun_star_xml_dom_XSAXDocumentBuilder2_idl
 
-#include <com/sun/star/xml/sax/XDocumentHandler.idl>
+#include <com/sun/star/xml/sax/XFastDocumentHandler.idl>
 #include <com/sun/star/xml/dom/XSAXDocumentBuilder.idl>
 
 module com {  module sun {  module star {  module xml { module dom {
@@ -33,7 +33,7 @@ module com {  module sun {  module star {  module xml { module dom {
 interface XSAXDocumentBuilder2
 {
     interface XSAXDocumentBuilder;
-    interface com::sun::star::xml::sax::XDocumentHandler;
+    interface com::sun::star::xml::sax::XFastDocumentHandler;
 };
 
 };};};};};
diff --git a/reportdesign/source/filter/xml/xmlfilter.cxx b/reportdesign/source/filter/xml/xmlfilter.cxx
index bf246129d9e3..054e9b2e39c9 100644
--- a/reportdesign/source/filter/xml/xmlfilter.cxx
+++ b/reportdesign/source/filter/xml/xmlfilter.cxx
@@ -745,10 +745,6 @@ SvXMLImportContext* ORptFilter::CreateDocumentContext( sal_uInt16 nPrefix,
         case XML_TOK_DOC_CONTENT:
             pContext = new RptXMLDocumentContentContext(*this, nPrefix, rLocalName);
             break;
-        case XML_TOK_DOC_META:
-            GetProgressBarHelper()->Increment( PROGRESS_BAR_STEP );
-            pContext = CreateMetaContext( rLocalName );
-            break;
         default:
             break;
     }
@@ -759,6 +755,23 @@ SvXMLImportContext* ORptFilter::CreateDocumentContext( sal_uInt16 nPrefix,
     return pContext;
 }
 
+SvXMLImportContext *ORptFilter::CreateFastContext( sal_Int32 nElement,
+        const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
+{
+    SvXMLImportContext *pContext = nullptr;
+
+    switch (nElement)
+    {
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_META ):
+            GetProgressBarHelper()->Increment( PROGRESS_BAR_STEP );
+            pContext = CreateMetaContext( nElement );
+            break;
+        default:
+            pContext = new SvXMLImportContext(*this);
+    }
+    return pContext;
+}
+
 const SvXMLTokenMap& ORptFilter::GetDocElemTokenMap() const
 {
     if ( !m_pDocElemTokenMap.get() )
@@ -1102,14 +1115,14 @@ void ORptFilter::insertFunction(const css::uno::Reference< css::report::XFunctio
     m_aFunctions.emplace(_xFunction->getName(),_xFunction);
 }
 
-SvXMLImportContext* ORptFilter::CreateMetaContext(const OUString& rLocalName)
+SvXMLImportContext* ORptFilter::CreateMetaContext(const sal_Int32 /*nElement*/)
 {
     SvXMLImportContext* pContext = nullptr;
 
     if ( getImportFlags() & SvXMLImportFlags::META )
     {
         uno::Reference<document::XDocumentPropertiesSupplier> xDPS(GetModel(), uno::UNO_QUERY_THROW);
-        pContext = new SvXMLMetaDocumentContext(*this,XML_NAMESPACE_OFFICE, rLocalName,xDPS->getDocumentProperties());
+        pContext = new SvXMLMetaDocumentContext(*this, xDPS->getDocumentProperties());
     }
     return pContext;
 }
diff --git a/reportdesign/source/filter/xml/xmlfilter.hxx b/reportdesign/source/filter/xml/xmlfilter.hxx
index eacb74e83969..6ecf8f061130 100644
--- a/reportdesign/source/filter/xml/xmlfilter.hxx
+++ b/reportdesign/source/filter/xml/xmlfilter.hxx
@@ -99,7 +99,7 @@ public:
     using SvXMLImport::SetMasterStyles;
     SvXMLImportContext* CreateStylesContext(const OUString& rLocalName,
                                             const Reference< XAttributeList>& xAttrList, bool bIsAutoStyle );
-    SvXMLImportContext* CreateMetaContext(const OUString& rLocalName);
+    SvXMLImportContext* CreateMetaContext(const sal_Int32 nElement);
     SvXMLImportContext* CreateFontDeclsContext(const OUString& rLocalName,
             const css::uno::Reference< css::xml::sax::XAttributeList > & xAttrList );
 protected:
@@ -108,6 +108,9 @@ protected:
             const OUString& rLocalName,
             const css::uno::Reference< css::xml::sax::XAttributeList >& xAttrList ) override;
 
+    virtual SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
+
     virtual XMLShapeImportHelper* CreateShapeImport() override;
 
     virtual ~ORptFilter()  throw() override;
diff --git a/sc/source/filter/xml/xmlimprt.cxx b/sc/source/filter/xml/xmlimprt.cxx
index 4e2c3bb56531..c85589ac9a73 100644
--- a/sc/source/filter/xml/xmlimprt.cxx
+++ b/sc/source/filter/xml/xmlimprt.cxx
@@ -234,10 +234,6 @@ protected:
     ScXMLImport& GetScImport() { return static_cast<ScXMLImport&>(GetImport()); }
 
 public:
-    ScXMLDocContext_Impl( ScXMLImport& rImport,
-        sal_uInt16 nPrfx,
-        const OUString& rLName );
-
     ScXMLDocContext_Impl( ScXMLImport& rImport );
 
     virtual SvXMLImportContextRef CreateChildContext( sal_uInt16 nPrefix,
@@ -256,13 +252,6 @@ public:
     virtual void SAL_CALL endFastElement(sal_Int32 nElement) override;
 };
 
-ScXMLDocContext_Impl::ScXMLDocContext_Impl( ScXMLImport& rImport, sal_uInt16 nPrfx,
-                                           const OUString& rLName ) :
-SvXMLImportContext( rImport, nPrfx, rLName )
-{
-
-}
-
 ScXMLDocContext_Impl::ScXMLDocContext_Impl( ScXMLImport& rImport ) :
 SvXMLImportContext( rImport )
 {
@@ -273,38 +262,23 @@ class ScXMLFlatDocContext_Impl
     : public ScXMLDocContext_Impl, public SvXMLMetaDocumentContext
 {
 public:
-    ScXMLFlatDocContext_Impl( ScXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
-        const uno::Reference<document::XDocumentProperties>& i_xDocProps);
 
     ScXMLFlatDocContext_Impl( ScXMLImport& i_rImport,
         const uno::Reference<document::XDocumentProperties>& i_xDocProps);
 
-    virtual SvXMLImportContextRef CreateChildContext(
-        sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-        const uno::Reference<xml::sax::XAttributeList>& i_xAttrList) override;
-
     virtual void SAL_CALL startFastElement (sal_Int32 nElement,
         const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList) override;
 
     virtual void SAL_CALL endFastElement(sal_Int32 nElement) override;
 
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
     virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL
         createFastChildContext( sal_Int32 nElement,
         const css::uno::Reference<css::xml::sax::XFastAttributeList>& xAttrList ) override;
 };
 
 ScXMLFlatDocContext_Impl::ScXMLFlatDocContext_Impl( ScXMLImport& i_rImport,
-                                                   sal_uInt16 i_nPrefix, const OUString & i_rLName,
-                                                   const uno::Reference<document::XDocumentProperties>& i_xDocProps) :
-SvXMLImportContext(i_rImport, i_nPrefix, i_rLName),
-ScXMLDocContext_Impl(i_rImport, i_nPrefix, i_rLName),
-SvXMLMetaDocumentContext(i_rImport, i_nPrefix, i_rLName,
-                         i_xDocProps)
-{
-}
-
-ScXMLFlatDocContext_Impl::ScXMLFlatDocContext_Impl( ScXMLImport& i_rImport,
                                                    const uno::Reference<document::XDocumentProperties>& i_xDocProps) :
 SvXMLImportContext(i_rImport),
 ScXMLDocContext_Impl(i_rImport),
@@ -312,29 +286,14 @@ SvXMLMetaDocumentContext(i_rImport, i_xDocProps)
 {
 }
 
-SvXMLImportContextRef ScXMLFlatDocContext_Impl::CreateChildContext(
-    sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-    const uno::Reference<xml::sax::XAttributeList>& i_xAttrList)
-{
-    // behave like meta base class iff we encounter office:meta
-    const SvXMLTokenMap& rTokenMap = GetScImport().GetDocElemTokenMap();
-    if ( XML_TOK_DOC_META == rTokenMap.Get( i_nPrefix, i_rLocalName ) ) {
-        return SvXMLMetaDocumentContext::CreateChildContext(
-            i_nPrefix, i_rLocalName, i_xAttrList );
-    } else {
-        return ScXMLDocContext_Impl::CreateChildContext(
-            i_nPrefix, i_rLocalName, i_xAttrList );
-    }
-}
-
 uno::Reference< xml::sax::XFastContextHandler > SAL_CALL
     ScXMLFlatDocContext_Impl::createFastChildContext( sal_Int32 nElement,
     const uno::Reference< xml::sax::XFastAttributeList > & xAttrList )
 {
-    if ( nElement != XML_ELEMENT( OFFICE, XML_META ) )
-        return ScXMLDocContext_Impl::createFastChildContext( nElement, xAttrList );
+    if ( nElement == XML_ELEMENT( OFFICE, XML_META ) )
+        return SvXMLMetaDocumentContext::createFastChildContext( nElement, xAttrList );
     else
-        return new SvXMLImportContext( GetImport() );
+        return ScXMLDocContext_Impl::createFastChildContext( nElement, xAttrList );
 }
 
 void SAL_CALL ScXMLFlatDocContext_Impl::startFastElement(sal_Int32 nElement,
@@ -348,6 +307,11 @@ void SAL_CALL ScXMLFlatDocContext_Impl::endFastElement(sal_Int32 nElement)
     SvXMLMetaDocumentContext::endFastElement( nElement );
 }
 
+void SAL_CALL ScXMLFlatDocContext_Impl::characters(const OUString& rChars)
+{
+    SvXMLMetaDocumentContext::characters(rChars);
+}
+
 class ScXMLBodyContext_Impl : public ScXMLImportContext
 {
 public:
@@ -659,29 +623,6 @@ sc::PivotTableSources& ScXMLImport::GetPivotTableSources()
     return *mpPivotSources;
 }
 
-SvXMLImportContext *ScXMLImport::CreateDocumentContext( sal_uInt16 nPrefix,
-                                               const OUString& rLocalName,
-                                               const uno::Reference<xml::sax::XAttributeList>& xAttrList )
-{
-    SvXMLImportContext *pContext = nullptr;
-
-    if ( (XML_NAMESPACE_OFFICE == nPrefix) &&
-        ( IsXMLToken(rLocalName, XML_DOCUMENT_META)) ) {
-            pContext = CreateMetaContext(rLocalName);
-    } else if ( (XML_NAMESPACE_OFFICE == nPrefix) &&
-        ( IsXMLToken(rLocalName, XML_DOCUMENT)) ) {
-            uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
-                GetModel(), uno::UNO_QUERY_THROW);
-            // flat OpenDocument file format
-            pContext = new ScXMLFlatDocContext_Impl( *this, nPrefix, rLocalName,
-                xDPS->getDocumentProperties());
-    }
-    else
-        pContext = SvXMLImport::CreateDocumentContext( nPrefix, rLocalName, xAttrList );
-
-    return pContext;
-}
-
 SvXMLImportContext *ScXMLImport::CreateFastContext( sal_Int32 nElement,
         const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
 {
@@ -695,6 +636,10 @@ SvXMLImportContext *ScXMLImport::CreateFastContext( sal_Int32 nElement,
         pContext = new ScXMLDocContext_Impl( *this );
         break;
 
+    case XML_ELEMENT( OFFICE, XML_DOCUMENT_META ):
+        pContext = CreateMetaContext(nElement);
+        break;
+
     case XML_ELEMENT( OFFICE, XML_DOCUMENT ):
     {
         uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
@@ -847,7 +792,7 @@ SvXMLImportContext *ScXMLImport::CreateBodyContext(const rtl::Reference<sax_fast
 }
 
 SvXMLImportContext *ScXMLImport::CreateMetaContext(
-    const OUString& rLocalName )
+    const sal_Int32 /*nElement*/ )
 {
     SvXMLImportContext* pContext = nullptr;
 
@@ -857,14 +802,11 @@ SvXMLImportContext *ScXMLImport::CreateMetaContext(
             GetModel(), uno::UNO_QUERY_THROW);
         uno::Reference<document::XDocumentProperties> const xDocProps(
             (IsStylesOnlyMode()) ? nullptr : xDPS->getDocumentProperties());
-        pContext = new SvXMLMetaDocumentContext(*this,
-            XML_NAMESPACE_OFFICE, rLocalName,
-            xDocProps);
+        pContext = new SvXMLMetaDocumentContext(*this, xDocProps);
     }
 
     if( !pContext )
-        pContext = new SvXMLImportContext( *this,
-        XML_NAMESPACE_OFFICE, rLocalName );
+        pContext = new SvXMLImportContext( *this );
 
     return pContext;
 }
diff --git a/sc/source/filter/xml/xmlimprt.hxx b/sc/source/filter/xml/xmlimprt.hxx
index 1639c3285b0b..ed7df03a0f79 100644
--- a/sc/source/filter/xml/xmlimprt.hxx
+++ b/sc/source/filter/xml/xmlimprt.hxx
@@ -299,10 +299,8 @@ class ScXMLImport: public SvXMLImport
 
 protected:
 
-    virtual SvXMLImportContext *CreateDocumentContext(sal_uInt16 nPrefix,
-                                      const OUString& rLocalName,
-                                      const css::uno::Reference<css::xml::sax::XAttributeList>& xAttrList ) override;
-
+    // This method is called after the namespace map has been updated, but
+    // before a context for the current element has been pushed.
     virtual SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
         const ::css::uno::Reference< ::css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
@@ -322,7 +320,7 @@ public:
     // NB: in contrast to other CreateFooContexts, this particular one handles
     //     the root element (i.e. office:document-meta)
     SvXMLImportContext *CreateMetaContext(
-                                    const OUString& rLocalName );
+                                    const sal_Int32 nElement );
     SvXMLImportContext *CreateFontDeclsContext(const sal_uInt16 nPrefix, const OUString& rLocalName,
                                      const css::uno::Reference<css::xml::sax::XAttributeList>& xAttrList);
     SvXMLImportContext *CreateScriptContext(
diff --git a/sd/source/filter/xml/sdxmlwrp.cxx b/sd/source/filter/xml/sdxmlwrp.cxx
index da0c95bc12f3..3f8ad2f5f623 100644
--- a/sd/source/filter/xml/sdxmlwrp.cxx
+++ b/sd/source/filter/xml/sdxmlwrp.cxx
@@ -41,6 +41,7 @@
 #include <strmname.h>
 #include <svx/xmleohlp.hxx>
 #include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <com/sun/star/xml/sax/XFastParser.hpp>
 #include <com/sun/star/document/XFilter.hpp>
 #include <com/sun/star/document/XImporter.hpp>
 #include <com/sun/star/document/XExporter.hpp>
@@ -216,11 +217,18 @@ ErrCode ReadThroughComponent(
     // connect model and filter
     Reference < XImporter > xImporter( xFilter, UNO_QUERY );
     xImporter->setTargetDocument( xModelComponent );
+
+    uno::Reference< xml::sax::XFastParser > xFastParser = dynamic_cast<
+                            xml::sax::XFastParser* >( xFilter.get() );
+
     // finally, parser the stream
     SAL_INFO( "sd.filter", "parsing stream" );
     try
     {
-        xParser->parseStream( aParserInput );
+        if( xFastParser.is() )
+            xFastParser->parseStream( aParserInput );
+        else
+            xParser->parseStream( aParserInput );
     }
     catch (const xml::sax::SAXParseException& r)
     {
diff --git a/sdext/CppunitTest_sdext_pdfimport.mk b/sdext/CppunitTest_sdext_pdfimport.mk
index 83f3131fe40e..f5fc54696329 100644
--- a/sdext/CppunitTest_sdext_pdfimport.mk
+++ b/sdext/CppunitTest_sdext_pdfimport.mk
@@ -30,6 +30,7 @@ $(eval $(call gb_CppunitTest_use_libraries,sdext_pdfimport,\
     sal \
     test \
     unotest \
+    xo \
 ))
 
 $(eval $(call gb_CppunitTest_use_library_objects,sdext_pdfimport,pdfimport))
diff --git a/sdext/Executable_pdf2xml.mk b/sdext/Executable_pdf2xml.mk
index 373f40da36fd..c0f7fe6f5727 100644
--- a/sdext/Executable_pdf2xml.mk
+++ b/sdext/Executable_pdf2xml.mk
@@ -30,6 +30,7 @@ $(eval $(call gb_Executable_use_libraries,pdf2xml,\
     unotest \
     cppuhelper \
     sal \
+    xo \
 ))
 
 $(eval $(call gb_Executable_use_library_objects,pdf2xml,pdfimport))
diff --git a/sdext/Executable_pdfunzip.mk b/sdext/Executable_pdfunzip.mk
index 74b1a964b0f1..006f8e5c9430 100644
--- a/sdext/Executable_pdfunzip.mk
+++ b/sdext/Executable_pdfunzip.mk
@@ -28,6 +28,7 @@ $(eval $(call gb_Executable_use_libraries,pdfunzip,\
     cppuhelper \
     sal \
     vcl \
+    xo \
 ))
 
 $(eval $(call gb_Executable_use_library_objects,pdfunzip,pdfimport))
diff --git a/sdext/Library_pdfimport.mk b/sdext/Library_pdfimport.mk
index 7c11d36e42ba..465a406b66b8 100644
--- a/sdext/Library_pdfimport.mk
+++ b/sdext/Library_pdfimport.mk
@@ -27,6 +27,7 @@ $(eval $(call gb_Library_use_libraries,pdfimport,\
     cppu \
     cppuhelper \
     sal \
+    xo \
 ))
 
 $(eval $(call gb_Library_use_externals,pdfimport,\
diff --git a/sdext/source/pdfimport/sax/emitcontext.cxx b/sdext/source/pdfimport/sax/emitcontext.cxx
index 7559d1e0ce2a..f21b17e60c88 100644
--- a/sdext/source/pdfimport/sax/emitcontext.cxx
+++ b/sdext/source/pdfimport/sax/emitcontext.cxx
@@ -27,6 +27,7 @@
 #include <cppuhelper/exc_hlp.hxx>
 #include <com/sun/star/xml/sax/SAXException.hpp>
 #include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+#include <xmloff/xmlimp.hxx>
 
 #if OSL_DEBUG_LEVEL > 0
 #include <osl/file.hxx>
@@ -43,6 +44,8 @@ SaxEmitter::SaxEmitter( const uno::Reference< xml::sax::XDocumentHandler >& xDoc
     m_xDocHdl( xDocHdl )
 {
     OSL_PRECOND(m_xDocHdl.is(), "SaxEmitter(): invalid doc handler");
+    if (SvXMLImport *pFastHandler = dynamic_cast<SvXMLImport*>(m_xDocHdl.get()))
+        m_xDocHdl.set( new SvXMLLegacyToFastDocHandler( pFastHandler ) );
     try
     {
         m_xDocHdl->startDocument();
diff --git a/sfx2/source/doc/SfxDocumentMetaData.cxx b/sfx2/source/doc/SfxDocumentMetaData.cxx
index a15ea43e0ed6..7e696129ad78 100644
--- a/sfx2/source/doc/SfxDocumentMetaData.cxx
+++ b/sfx2/source/doc/SfxDocumentMetaData.cxx
@@ -48,6 +48,7 @@
 #include <com/sun/star/document/XFilter.hpp>
 #include <com/sun/star/xml/sax/Parser.hpp>
 #include <com/sun/star/xml/sax/Writer.hpp>
+#include <com/sun/star/xml/sax/XFastParser.hpp>
 #include <com/sun/star/xml/dom/DOMException.hpp>
 #include <com/sun/star/xml/dom/XDocument.hpp>
 #include <com/sun/star/xml/dom/XElement.hpp>
@@ -1770,8 +1771,13 @@ SfxDocumentMetaData::loadFromStorage(
         css::uno::UNO_QUERY_THROW);
     xImp->setTargetDocument(css::uno::Reference<css::lang::XComponent>(this));
     xParser->setDocumentHandler(xDocHandler);
+    css::uno::Reference< css::xml::sax::XFastParser > xFastParser = dynamic_cast<
+                            css::xml::sax::XFastParser* >( xDocHandler.get() );
     try {
-        xParser->parseStream(input);
+        if( xFastParser.is() )
+            xFastParser->parseStream(input);
+        else
+            xParser->parseStream(input);
     } catch (const css::xml::sax::SAXException &) {
         throw css::io::WrongFormatException(
                 "SfxDocumentMetaData::loadFromStorage:"
diff --git a/starmath/source/mathmlimport.cxx b/starmath/source/mathmlimport.cxx
index 59b42570a2d0..a531412cf573 100644
--- a/starmath/source/mathmlimport.cxx
+++ b/starmath/source/mathmlimport.cxx
@@ -24,6 +24,7 @@ one go*/
 
 #include <com/sun/star/xml/sax/InputSource.hpp>
 #include <com/sun/star/xml/sax/Parser.hpp>
+#include <com/sun/star/xml/sax/XFastParser.hpp>
 #include <com/sun/star/document/XDocumentProperties.hpp>
 #include <com/sun/star/document/XDocumentPropertiesSupplier.hpp>
 #include <com/sun/star/packages/WrongPasswordException.hpp>
@@ -286,10 +287,16 @@ ErrCode SmXMLImportWrapper::ReadThroughComponent(
     Reference < XImporter > xImporter( xFilter, UNO_QUERY );
     xImporter->setTargetDocument( xModelComponent );
 
+    uno::Reference< xml::sax::XFastParser > xFastParser = dynamic_cast<
+                            xml::sax::XFastParser* >( xFilter.get() );
+
     // finally, parser the stream
     try
     {
-        xParser->parseStream( aParserInput );
+        if( xFastParser.is() )
+            xFastParser->parseStream( aParserInput );
+        else
+            xParser->parseStream( aParserInput );
 
         uno::Reference<lang::XUnoTunnel> xFilterTunnel( xFilter, uno::UNO_QUERY );
         SmXMLImport *pFilter = reinterpret_cast< SmXMLImport * >(
@@ -1935,11 +1942,20 @@ public:
 class SmXMLOfficeContext_Impl : public virtual SvXMLImportContext
 {
 public:
-    SmXMLOfficeContext_Impl( SmXMLImport &rImport, sal_uInt16 nPrfx,
-        const OUString& rLName)
-        : SvXMLImportContext(rImport,nPrfx,rLName) {}
+    SmXMLOfficeContext_Impl( SmXMLImport &rImport )
+        : SvXMLImportContext(rImport) {}
+
+    virtual void SAL_CALL characters( const OUString& /*aChars*/ ) override {}
+
+    virtual void SAL_CALL startFastElement( sal_Int32 /*nElement*/,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& /*xAttrList*/ ) override {}
+
+    virtual void SAL_CALL endFastElement( sal_Int32 /*nElement*/ ) override {}
 
     virtual SvXMLImportContextRef CreateChildContext(sal_uInt16 nPrefix, const OUString& rLocalName, const uno::Reference< xml::sax::XAttributeList > &xAttrList) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 };
 
 SvXMLImportContextRef SmXMLOfficeContext_Impl::CreateChildContext(sal_uInt16 nPrefix,
@@ -1965,6 +1981,12 @@ SvXMLImportContextRef SmXMLOfficeContext_Impl::CreateChildContext(sal_uInt16 nPr
     return pContext;
 }
 
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SmXMLOfficeContext_Impl::createFastChildContext(
+    sal_Int32 /*nElement*/, const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
+{
+    return new SvXMLImportContext( GetImport() );
+}
+
 
 // context for flat file xml format
 class SmXMLFlatDocContext_Impl
@@ -1972,41 +1994,59 @@ class SmXMLFlatDocContext_Impl
 {
 public:
     SmXMLFlatDocContext_Impl( SmXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
         const uno::Reference<document::XDocumentProperties>& i_xDocProps);
 
-    virtual SvXMLImportContextRef CreateChildContext(sal_uInt16 i_nPrefix, const OUString& i_rLocalName, const uno::Reference<xml::sax::XAttributeList>& i_xAttrList) override;
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
+    virtual void SAL_CALL startFastElement( sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
+
+    virtual void SAL_CALL endFastElement( sal_Int32 nElement ) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 };
 
 SmXMLFlatDocContext_Impl::SmXMLFlatDocContext_Impl( SmXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
         const uno::Reference<document::XDocumentProperties>& i_xDocProps) :
-    SvXMLImportContext(i_rImport, i_nPrefix, i_rLName),
-    SmXMLOfficeContext_Impl(i_rImport, i_nPrefix, i_rLName),
-    SvXMLMetaDocumentContext(i_rImport, i_nPrefix, i_rLName,
-        i_xDocProps)
+    SvXMLImportContext(i_rImport),
+    SmXMLOfficeContext_Impl(i_rImport),
+    SvXMLMetaDocumentContext(i_rImport, i_xDocProps)
+{
+}
+
+void SAL_CALL SmXMLFlatDocContext_Impl::startFastElement( sal_Int32 nElement,
+    const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
+{
+    SvXMLMetaDocumentContext::startFastElement(nElement, xAttrList);
+}
+
+void SAL_CALL SmXMLFlatDocContext_Impl::endFastElement( sal_Int32 nElement )
 {
+    SvXMLMetaDocumentContext::endFastElement(nElement);
 }
 
-SvXMLImportContextRef SmXMLFlatDocContext_Impl::CreateChildContext(
-    sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-    const uno::Reference<xml::sax::XAttributeList>& i_xAttrList)
+void SAL_CALL SmXMLFlatDocContext_Impl::characters( const OUString& rChars )
+{
+    SvXMLMetaDocumentContext::characters(rChars);
+}
+
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SmXMLFlatDocContext_Impl::createFastChildContext(
+    sal_Int32 nElement, const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
     // behave like meta base class iff we encounter office:meta
-    if ( XML_NAMESPACE_OFFICE == i_nPrefix &&
-            i_rLocalName == GetXMLToken(XML_META) )
+    if ( nElement == XML_ELEMENT(OFFICE, XML_META) )
     {
-        return SvXMLMetaDocumentContext::CreateChildContext(
-                    i_nPrefix, i_rLocalName, i_xAttrList );
+        return SvXMLMetaDocumentContext::createFastChildContext(
+                    nElement, xAttrList );
     }
     else
     {
-        return SmXMLOfficeContext_Impl::CreateChildContext(
-                    i_nPrefix, i_rLocalName, i_xAttrList );
+        return SmXMLOfficeContext_Impl::createFastChildContext(
+                    nElement, xAttrList );
     }
 }
 
-
 static const SvXMLTokenMapEntry aPresLayoutElemTokenMap[] =
 {
     { XML_NAMESPACE_MATH,   XML_SEMANTICS, XML_TOK_SEMANTICS },
@@ -2823,28 +2863,40 @@ SvXMLImportContext *SmXMLImport::CreateDocumentContext(sal_uInt16 nPrefix,
     const OUString &rLocalName,
     const uno::Reference <xml::sax::XAttributeList> & /*xAttrList*/)
 {
-    if ( XML_NAMESPACE_OFFICE == nPrefix )
+    SvXMLImportContext *pContext = nullptr;
+    if ( XML_NAMESPACE_OFFICE != nPrefix )
+        pContext = new SmXMLDocContext_Impl(*this,nPrefix,rLocalName);
+
+    return pContext;
+}
+
+SvXMLImportContext *SmXMLImport::CreateFastContext(sal_Int32 nElement,
+    const uno::Reference <xml::sax::XFastAttributeList> & /*xAttrList*/)
+{
+    SvXMLImportContext *pContext = nullptr;
+
+    switch (nElement)
     {
-        if ( IsXMLToken(rLocalName, XML_DOCUMENT) ||
-             IsXMLToken(rLocalName, XML_DOCUMENT_META) )
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT ):
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_META ):
         {
             uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
                 GetModel(), uno::UNO_QUERY_THROW);
-            return IsXMLToken(rLocalName, XML_DOCUMENT_META)
-                ? new SvXMLMetaDocumentContext(*this,
-                        XML_NAMESPACE_OFFICE, rLocalName,
-                        xDPS->getDocumentProperties())
+            pContext = ( (nElement & TOKEN_MASK) == XML_DOCUMENT_META )
+                ? new SvXMLMetaDocumentContext( *this,
+                        xDPS->getDocumentProperties() )
                 // flat OpenDocument file format -- this has not been tested...
-                : new SmXMLFlatDocContext_Impl( *this, nPrefix, rLocalName,
-                            xDPS->getDocumentProperties());
-        }
-        else
-        {
-            return new SmXMLOfficeContext_Impl( *this,nPrefix,rLocalName);
+                : new SmXMLFlatDocContext_Impl( *this,
+                            xDPS->getDocumentProperties() );
         }
+        break;
+        default:
+            if ((nElement & NMSP_MASK) == NAMESPACE_TOKEN(XML_NAMESPACE_OFFICE))
+                pContext = new SmXMLOfficeContext_Impl(*this);
+            else
+                pContext = new SvXMLImportContext(*this);
     }
-    else
-        return new SmXMLDocContext_Impl(*this,nPrefix,rLocalName);
+    return pContext;
 }
 
 SvXMLImportContext *SmXMLImport::CreateRowContext(sal_uInt16 nPrefix,
diff --git a/starmath/source/mathmlimport.hxx b/starmath/source/mathmlimport.hxx
index a0d2c6254f0c..b91a51bea2bd 100644
--- a/starmath/source/mathmlimport.hxx
+++ b/starmath/source/mathmlimport.hxx
@@ -99,6 +99,9 @@ public:
         const OUString &rLocalName,
         const css::uno::Reference <
         css::xml::sax::XAttributeList> &xAttrList) override;
+    SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
+        const css::uno::Reference<
+        css::xml::sax::XFastAttributeList >& xAttrList ) override;
     SvXMLImportContext *CreateRowContext(sal_uInt16 nPrefix,
         const OUString &rLocalName);
     SvXMLImportContext *CreateEncloseContext(sal_uInt16 nPrefix,
diff --git a/sw/source/filter/xml/swxml.cxx b/sw/source/filter/xml/swxml.cxx
index a96433fa042e..cb5b122f5373 100644
--- a/sw/source/filter/xml/swxml.cxx
+++ b/sw/source/filter/xml/swxml.cxx
@@ -34,6 +34,7 @@
 #include <com/sun/star/packages/zip/ZipIOException.hpp>
 #include <com/sun/star/packages/WrongPasswordException.hpp>
 #include <com/sun/star/ucb/InteractiveAugmentedIOException.hpp>
+#include <com/sun/star/xml/sax/XFastParser.hpp>
 #include <o3tl/any.hxx>
 #include <vcl/errinf.hxx>
 #include <sfx2/docfile.hxx>
@@ -168,11 +169,16 @@ ErrCode ReadThroughComponent(
     // connect model and filter
     uno::Reference < XImporter > xImporter( xFilter, UNO_QUERY );
     xImporter->setTargetDocument( xModelComponent );
+    uno::Reference< xml::sax::XFastParser > xFastParser = dynamic_cast<
+                            xml::sax::XFastParser* >( xFilter.get() );
 
     // finally, parser the stream
     try
     {
-        xParser->parseStream( aParserInput );
+        if( xFastParser.is() )
+            xFastParser->parseStream( aParserInput );
+        else
+            xParser->parseStream( aParserInput );
     }
     catch( xml::sax::SAXParseException& r )
     {
diff --git a/sw/source/filter/xml/xmlimp.cxx b/sw/source/filter/xml/xmlimp.cxx
index 01460f6fe4c5..1a4988339d5a 100644
--- a/sw/source/filter/xml/xmlimp.cxx
+++ b/sw/source/filter/xml/xmlimp.cxx
@@ -196,9 +196,14 @@ public:
     SwXMLDocContext_Impl( SwXMLImport& rImport, sal_uInt16 nPrfx,
                 const OUString& rLName );
 
+    SwXMLDocContext_Impl( SwXMLImport& rImport );
+
     virtual SvXMLImportContextRef CreateChildContext( sal_uInt16 nPrefix,
                 const OUString& rLocalName,
                 const Reference< xml::sax::XAttributeList > & xAttrList ) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 };
 
 SwXMLDocContext_Impl::SwXMLDocContext_Impl( SwXMLImport& rImport,
@@ -207,6 +212,17 @@ SwXMLDocContext_Impl::SwXMLDocContext_Impl( SwXMLImport& rImport,
 {
 }
 
+SwXMLDocContext_Impl::SwXMLDocContext_Impl( SwXMLImport& rImport ) :
+    SvXMLImportContext( rImport )
+{
+}
+
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SwXMLDocContext_Impl::createFastChildContext(
+    sal_Int32 /*nElement*/, const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
+{
+    return new SvXMLImportContext( GetImport() );
+}
+
 SvXMLImportContextRef SwXMLDocContext_Impl::CreateChildContext(
         sal_uInt16 nPrefix,
         const OUString& rLocalName,
@@ -271,51 +287,41 @@ class SwXMLOfficeDocContext_Impl :
 public:
 
     SwXMLOfficeDocContext_Impl( SwXMLImport& rImport,
-                sal_uInt16 nPrfx,
-                const OUString& rLName,
                 const Reference< document::XDocumentProperties >& xDocProps);
 
-    virtual SvXMLImportContextRef CreateChildContext(
-                sal_uInt16 nPrefix,
-                const OUString& rLocalName,
-                const Reference< xml::sax::XAttributeList > & xAttrList ) override;
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& Attribs ) override;
 };
 
 SwXMLOfficeDocContext_Impl::SwXMLOfficeDocContext_Impl(
                 SwXMLImport& rImport,
-                sal_uInt16 nPrfx,
-                const OUString& rLName,
                 const Reference< document::XDocumentProperties >& xDocProps) :
-    SvXMLImportContext( rImport, nPrfx, rLName ),
-    SwXMLDocContext_Impl( rImport, nPrfx, rLName ),
-    SvXMLMetaDocumentContext( rImport, nPrfx, rLName, xDocProps)
+    SvXMLImportContext( rImport ),
+    SwXMLDocContext_Impl( rImport ),
+    SvXMLMetaDocumentContext( rImport, xDocProps )
 {
 }
 
-SvXMLImportContextRef SwXMLOfficeDocContext_Impl::CreateChildContext(
-                sal_uInt16 nPrefix,
-                const OUString& rLocalName,
-                const Reference< xml::sax::XAttributeList > & xAttrList )
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SwXMLOfficeDocContext_Impl::createFastChildContext(
+    sal_Int32 nElement, const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
-    const SvXMLTokenMap& rTokenMap = GetSwImport().GetDocElemTokenMap();
-
     // assign paragraph styles to list levels of outline style after all styles
     // are imported and finished. This is the case, when <office:body> starts
     // in flat OpenDocument file format.
     {
-        if ( rTokenMap.Get( nPrefix, rLocalName ) == XML_TOK_DOC_BODY )
+        if( nElement == XML_ELEMENT( OFFICE, XML_BODY ) )
         {
             GetImport().GetTextImport()->SetOutlineStyles( true );
         }
     }
 
     // behave like meta base class iff we encounter office:meta
-    if ( XML_TOK_DOC_META == rTokenMap.Get( nPrefix, rLocalName ) ) {
-        return SvXMLMetaDocumentContext::CreateChildContext(
-                    nPrefix, rLocalName, xAttrList );
+    if ( nElement == XML_ELEMENT( OFFICE, XML_META ) ) {
+        return SvXMLMetaDocumentContext::createFastChildContext(
+                    nElement, xAttrList );
     } else {
-        return SwXMLDocContext_Impl::CreateChildContext(
-                    nPrefix, rLocalName, xAttrList );
+        return SwXMLDocContext_Impl::createFastChildContext(
+                    nElement, xAttrList );
     }
 }
 
@@ -370,30 +376,40 @@ SvXMLImportContext *SwXMLImport::CreateDocumentContext(
           IsXMLToken( rLocalName, XML_DOCUMENT_CONTENT ) ))
         pContext = new SwXMLDocContext_Impl( *this, nPrefix, rLocalName );
     else if ( XML_NAMESPACE_OFFICE==nPrefix &&
-              IsXMLToken( rLocalName, XML_DOCUMENT_META ) )
-    {
-        pContext = CreateMetaContext(rLocalName);
-    }
-    else if ( XML_NAMESPACE_OFFICE==nPrefix &&
               IsXMLToken( rLocalName, XML_DOCUMENT_STYLES ) )
     {
         pContext = new SwXMLDocStylesContext_Impl( *this, nPrefix, rLocalName );
     }
-    else if ( XML_NAMESPACE_OFFICE==nPrefix &&
-              IsXMLToken( rLocalName, XML_DOCUMENT ) )
-    {
-        uno::Reference<document::XDocumentProperties> const xDocProps(
-            GetDocumentProperties());
-        // flat OpenDocument file format
-        pContext = new SwXMLOfficeDocContext_Impl( *this, nPrefix, rLocalName,
-                        xDocProps);
-    }
     else
         pContext = SvXMLImport::CreateDocumentContext(nPrefix, rLocalName, xAttrList);
 
     return pContext;
 }
 
+SvXMLImportContext *SwXMLImport::CreateFastContext( sal_Int32 nElement,
+        const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
+{
+    SvXMLImportContext *pContext = nullptr;
+
+    switch (nElement)
+    {
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_META ):
+            pContext = CreateMetaContext(nElement);
+        break;
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT ):
+        {
+            uno::Reference<document::XDocumentProperties> const xDocProps(
+                GetDocumentProperties());
+            // flat OpenDocument file format
+            pContext = new SwXMLOfficeDocContext_Impl( *this, xDocProps );
+        }
+        break;
+        default:
+            pContext = new SvXMLImportContext( *this );
+    }
+    return pContext;
+}
+
 SwXMLImport::SwXMLImport(
     const uno::Reference< uno::XComponentContext >& rContext,
     OUString const & implementationName, SvXMLImportFlags nImportFlags)
diff --git a/sw/source/filter/xml/xmlimp.hxx b/sw/source/filter/xml/xmlimp.hxx
index 8907970b62e9..cd399ea4821f 100644
--- a/sw/source/filter/xml/xmlimp.hxx
+++ b/sw/source/filter/xml/xmlimp.hxx
@@ -107,6 +107,9 @@ protected:
                   const OUString& rLocalName,
                   const css::uno::Reference< css::xml::sax::XAttributeList > & xAttrList ) override;
 
+    virtual SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
+        const ::css::uno::Reference< ::css::xml::sax::XFastAttributeList >& xAttrList ) override;
+
     virtual XMLTextImportHelper* CreateTextImport() override;
 
     virtual XMLShapeImportHelper* CreateShapeImport() override;
@@ -136,7 +139,7 @@ public:
 
     // NB: in contrast to other CreateFooContexts, this particular one handles
     //     the root element (i.e. office:document-meta)
-    SvXMLImportContext *CreateMetaContext( const OUString& rLocalName );
+    SvXMLImportContext *CreateMetaContext( const sal_Int32 nElement );
     SvXMLImportContext *CreateScriptContext( const OUString& rLocalName );
     SvXMLImportContext *CreateStylesContext(
                 const OUString& rLocalName,
diff --git a/sw/source/filter/xml/xmlmeta.cxx b/sw/source/filter/xml/xmlmeta.cxx
index ddc37f10c8b9..3dcf81038287 100644
--- a/sw/source/filter/xml/xmlmeta.cxx
+++ b/sw/source/filter/xml/xmlmeta.cxx
@@ -53,7 +53,7 @@ SwXMLImport::GetDocumentProperties() const
 }
 
 SvXMLImportContext *SwXMLImport::CreateMetaContext(
-                                       const OUString& rLocalName )
+                                       const sal_Int32 /*nElement*/ )
 {
     SvXMLImportContext *pContext = nullptr;
 
@@ -61,13 +61,11 @@ SvXMLImportContext *SwXMLImport::CreateMetaContext(
     {
         uno::Reference<document::XDocumentProperties> const xDocProps(
                 GetDocumentProperties());
-        pContext = new SvXMLMetaDocumentContext(*this,
-                    XML_NAMESPACE_OFFICE, rLocalName, xDocProps);
+        pContext = new SvXMLMetaDocumentContext(*this, xDocProps);
     }
 
     if( !pContext )
-        pContext = new SvXMLImportContext( *this,
-                        XML_NAMESPACE_OFFICE, rLocalName );
+        pContext = new SvXMLImportContext( *this );
 
     return pContext;
 }
diff --git a/unoxml/Library_unoxml.mk b/unoxml/Library_unoxml.mk
index c55e4d6cf725..335bf10e9b38 100644
--- a/unoxml/Library_unoxml.mk
+++ b/unoxml/Library_unoxml.mk
@@ -32,6 +32,7 @@ $(eval $(call gb_Library_use_libraries,unoxml,\
     cppuhelper \
     cppu \
     sal \
+    xo \
 ))
 
 $(eval $(call gb_Library_use_externals,unoxml,\
diff --git a/unoxml/source/dom/saxbuilder.cxx b/unoxml/source/dom/saxbuilder.cxx
index 626293a4d4a7..698d923a3ba9 100644
--- a/unoxml/source/dom/saxbuilder.cxx
+++ b/unoxml/source/dom/saxbuilder.cxx
@@ -23,6 +23,8 @@
 #include <com/sun/star/xml/sax/SAXException.hpp>
 #include <comphelper/processfactory.hxx>
 #include <cppuhelper/supportsservice.hxx>
+#include <sax/fastattribs.hxx>
+#include <xmloff/xmlimp.hxx>
 
 using namespace css::lang;
 using namespace css::uno;
@@ -90,7 +92,6 @@ namespace DOM
         m_aDocument.clear();
         m_aFragment.clear();
         while (!m_aNodeStack.empty()) m_aNodeStack.pop();
-        while (!m_aNSStack.empty()) m_aNSStack.pop();
         m_aState = SAXDocumentBuilderState_READY;
     }
 
@@ -144,9 +145,8 @@ namespace DOM
         m_aState = SAXDocumentBuilderState_FRAGMENT_FINISHED;
     }
 
-    // document handler
-
-    void SAL_CALL  CSAXDocumentBuilder::startDocument()
+    //XFastDocumentHandler
+    void SAL_CALL CSAXDocumentBuilder::startDocument()
     {
         ::osl::MutexGuard g(m_Mutex);
 
@@ -177,107 +177,123 @@ namespace DOM
         m_aState = SAXDocumentBuilderState_DOCUMENT_FINISHED;
     }
 
-    void SAL_CALL CSAXDocumentBuilder::startElement(const OUString& aName, const Reference< XAttributeList>& attribs)
+    void SAL_CALL CSAXDocumentBuilder::processingInstruction( const OUString& rTarget, const OUString& rData )
     {
         ::osl::MutexGuard g(m_Mutex);
 
+        //  append PI node to the current top
         if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
              m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
-        {
             throw SAXException();
-        }
 
-        // start with mappings in effect for last level
-        NSMap aNSMap;
-        if (!m_aNSStack.empty())
-            aNSMap = NSMap(m_aNSStack.top());
-
-        // handle xmlns: attributes and add to mappings
-        OUString attr_qname;
-        OUString attr_value;
-        OUString newprefix;
-        AttrMap aAttrMap;
-        sal_Int32 idx=-1;
-        sal_Int16 nAttributes = attribs->getLength();
-        for (sal_Int16 i=0; i<nAttributes; i++)
+        Reference< XProcessingInstruction > aInstruction = m_aDocument->createProcessingInstruction(
+                rTarget, rData);
+        m_aNodeStack.top()->appendChild(aInstruction);
+    }
+
+    void SAL_CALL CSAXDocumentBuilder::setDocumentLocator( const Reference< XLocator >& xLocator )
+    {
+        ::osl::MutexGuard g(m_Mutex);
+
+        // set the document locator...
+        m_aLocator = xLocator;
+    }
+
+    void SAL_CALL CSAXDocumentBuilder::startFastElement( sal_Int32 nElement , const Reference< XFastAttributeList >& xAttribs  )
+    {
+        ::osl::MutexGuard g(m_Mutex);
+
+        if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
+             m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
         {
-            attr_qname = attribs->getNameByIndex(i);
-            attr_value = attribs->getValueByIndex(i);
-            // new prefix mapping
-            if (attr_qname.startsWith("xmlns:"))
-            {
-                newprefix = attr_qname.copy(attr_qname.indexOf(':')+1);
-                aNSMap.emplace(newprefix, attr_value);
-            }
-            else if ( attr_qname == "xmlns" )
-            {
-                // new default prefix
-                aNSMap.emplace(OUString(), attr_value);
-            }
-            else
-            {
-                aAttrMap.emplace(attr_qname, attr_value);
-            }
+            throw SAXException();
         }
 
-        // does the element have a prefix?
-        OUString aPrefix;
-        OUString aURI;
         Reference< XElement > aElement;
-        idx = aName.indexOf(':');
-        if (idx != -1)
-        {
-            aPrefix = aName.copy(0, idx);
-        }
-        else
-            aPrefix.clear();
+        const OUString& aPrefix( SvXMLImport::getNamespacePrefixFromToken( nElement ) );
+        const OUString& aURI( SvXMLImport::getNamespaceURIFromToken( nElement ) );
+        OUString aQualifiedName( SvXMLImport::getNameFromToken( nElement ) );
+        if( !aPrefix.isEmpty() )
+            aQualifiedName = aPrefix + SvXMLImport::aNamespaceSeparator + aQualifiedName;
 
-        NSMap::const_iterator result = aNSMap.find(aPrefix);
-        if ( result != aNSMap.end())
+        if ( !aURI.isEmpty() )
         {
             // found a URI for prefix
             // qualified name
-            aElement = m_aDocument->createElementNS( result->second, aName);
+            aElement = m_aDocument->createElementNS( aURI, aQualifiedName );
         }
         else
         {
             // no URI for prefix
-            aElement = m_aDocument->createElement(aName);
+            aElement = m_aDocument->createElement( aQualifiedName );
         }
         aElement.set( m_aNodeStack.top()->appendChild(aElement), UNO_QUERY);
         m_aNodeStack.push(aElement);
 
-        // set non xmlns attributes
-        aPrefix.clear();
-        aURI.clear();
-        AttrMap::const_iterator a = aAttrMap.begin();
-        while (a != aAttrMap.end())
+        if (xAttribs.is())
+            setElementFastAttributes(aElement, xAttribs);
+    }
+
+    // For arbitrary meta elements
+    void SAL_CALL CSAXDocumentBuilder::startUnknownElement( const OUString& rNamespace, const OUString& rName, const Reference< XFastAttributeList >& xAttribs )
+    {
+        ::osl::MutexGuard g(m_Mutex);
+
+        if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
+             m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
         {
-            attr_qname = a->first;
-            attr_value = a->second;
-            idx = attr_qname.indexOf(':');
-            if (idx != -1)
-                aPrefix = attr_qname.copy(0, idx);
-            else
-                aPrefix.clear();
+            throw SAXException();
+        }
+
+        Reference< XElement > aElement;
+        if ( !rNamespace.isEmpty() )
+            aElement = m_aDocument->createElementNS( rNamespace, rName );
+        else
+            aElement = m_aDocument->createElement( rName );
 
-            result = aNSMap.find(aPrefix);
-            if (result != aNSMap.end())
+        aElement.set( m_aNodeStack.top()->appendChild(aElement), UNO_QUERY);
+        m_aNodeStack.push(aElement);
+
+        if (xAttribs.is())
+        {
+            setElementFastAttributes(aElement, xAttribs);
+            Sequence< css::xml::Attribute > unknownAttribs = xAttribs->getUnknownAttributes();
+            sal_Int32 len = unknownAttribs.getLength();
+            for ( sal_Int32 i = 0; i < len; i++ )
             {
-                // set attribute with namespace
-                aElement->setAttributeNS(result->second, attr_qname, attr_value);
+                const OUString& rAttrValue = unknownAttribs[i].Value;
+                const OUString& rAttrName = unknownAttribs[i].Name;
+                const OUString& rAttrNamespace = unknownAttribs[i].NamespaceURL;
+                if ( !rAttrNamespace.isEmpty() )
+                    aElement->setAttributeNS( rAttrNamespace, rAttrName, rAttrValue );
+                else
+                    aElement->setAttribute( rAttrName, rAttrValue );
             }
+        }
+    }
+
+    void CSAXDocumentBuilder::setElementFastAttributes(const Reference< XElement >& aElement, const Reference< XFastAttributeList >& xAttribs)
+    {
+        sax_fastparser::FastAttributeList *pAttribList =
+            sax_fastparser::FastAttributeList::castToFastAttributeList( xAttribs );
+
+        for (auto &it : *pAttribList)
+        {
+            sal_Int32 nAttrToken = it.getToken();
+            const OUString& aAttrPrefix( SvXMLImport::getNamespacePrefixFromToken( nAttrToken ) );
+            const OUString& aAttrURI( SvXMLImport::getNamespaceURIFromToken( nAttrToken ) );
+            OUString aAttrQualifiedName( SvXMLImport::getNameFromToken( nAttrToken ) );
+            if( !aAttrPrefix.isEmpty() )
+                aAttrQualifiedName = aAttrPrefix + SvXMLImport::aNamespaceSeparator + aAttrQualifiedName;
+
+            if ( !aAttrURI.isEmpty() )
+                aElement->setAttributeNS( aAttrURI, aAttrQualifiedName, it.toString() );
             else
-            {
-                // set attribute without namespace
-                aElement->setAttribute(attr_qname, attr_value);
-            }
-            ++a;
+                aElement->setAttribute( aAttrQualifiedName, it.toString() );
         }
-        m_aNSStack.push(aNSMap);
     }
 
-    void SAL_CALL CSAXDocumentBuilder::endElement(const OUString& aName)
+    void SAL_CALL CSAXDocumentBuilder::endFastElement( sal_Int32 nElement )
     {
         ::osl::MutexGuard g(m_Mutex);
 
@@ -291,63 +307,64 @@ namespace DOM
             throw SAXException();
 
         Reference< XElement > aElement(aNode, UNO_QUERY);
-        OUString aRefName;
-        OUString aPrefix = aElement->getPrefix();
-        if (!aPrefix.isEmpty())
-            aRefName = aPrefix + ":" + aElement->getTagName();
-        else
-            aRefName = aElement->getTagName();
-        if (aRefName != aName) // consistency check
+        if( aElement->getPrefix() != SvXMLImport::getNamespacePrefixFromToken( nElement ) ||
+            aElement->getTagName() != SvXMLImport::getNameFromToken( nElement ) ) // consistency check
             throw SAXException();
 
         // pop it
         m_aNodeStack.pop();
-        m_aNSStack.pop();
     }
 
-    void SAL_CALL CSAXDocumentBuilder::characters(const OUString& aChars)
+
+    void SAL_CALL CSAXDocumentBuilder::endUnknownElement( const OUString& /*rNamespace*/, const OUString& rName )
     {
         ::osl::MutexGuard g(m_Mutex);
 
-        //  append text node to the current top element
-         if (m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
+        // pop the current element from the stack
+        if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
              m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
             throw SAXException();
 
-         Reference< XText > aText = m_aDocument->createTextNode(aChars);
-         m_aNodeStack.top()->appendChild(aText);
-    }
-
-    void SAL_CALL CSAXDocumentBuilder::ignorableWhitespace(const OUString& )
-    {
-        ::osl::MutexGuard g(m_Mutex);
+        Reference< XNode > aNode(m_aNodeStack.top());
+        if (aNode->getNodeType() != NodeType_ELEMENT_NODE)
+            throw SAXException();
 
-        //  ignore ignorable whitespace
-        if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
-             m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
+        Reference< XElement > aElement(aNode, UNO_QUERY);
+        OUString aRefName;
+        const OUString& aPrefix = aElement->getPrefix();
+        if (!aPrefix.isEmpty())
+            aRefName = aPrefix + SvXMLImport::aNamespaceSeparator + aElement->getTagName();
+        else
+            aRefName = aElement->getTagName();
+        if (aRefName != rName) // consistency check
             throw SAXException();
+
+        // pop it
+        m_aNodeStack.pop();
     }
 
-    void SAL_CALL CSAXDocumentBuilder::processingInstruction(const OUString& aTarget, const OUString& aData)
+    Reference< XFastContextHandler > SAL_CALL CSAXDocumentBuilder::createFastChildContext( sal_Int32/* nElement */, const Reference< XFastAttributeList >&/* xAttribs */ )
     {
-        ::osl::MutexGuard g(m_Mutex);
+        return nullptr;
+    }
 
-        //  append PI node to the current top
-        if ( m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
-             m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
-            throw SAXException();
 
-        Reference< XProcessingInstruction > aInstruction = m_aDocument->createProcessingInstruction(
-                aTarget, aData);
-        m_aNodeStack.top()->appendChild(aInstruction);
+    Reference< XFastContextHandler > SAL_CALL CSAXDocumentBuilder::createUnknownChildContext( const OUString&/* rNamespace */, const OUString&/* rName */, const Reference< XFastAttributeList >&/* xAttribs */ )
+    {
+        return nullptr;
     }
 
-    void SAL_CALL CSAXDocumentBuilder::setDocumentLocator(const Reference< XLocator >& aLocator)
+    void SAL_CALL CSAXDocumentBuilder::characters( const OUString& rChars )
     {
         ::osl::MutexGuard g(m_Mutex);
 
-        // set the document locator...
-        m_aLocator = aLocator;
+        //  append text node to the current top element
+         if (m_aState != SAXDocumentBuilderState_BUILDING_DOCUMENT &&
+             m_aState != SAXDocumentBuilderState_BUILDING_FRAGMENT)
+            throw SAXException();
+
+         Reference< XText > aText = m_aDocument->createTextNode(rChars);
+         m_aNodeStack.top()->appendChild(aText);
     }
 }
 
diff --git a/unoxml/source/dom/saxbuilder.hxx b/unoxml/source/dom/saxbuilder.hxx
index dd2331426c63..6f2ab24fcbbd 100644
--- a/unoxml/source/dom/saxbuilder.hxx
+++ b/unoxml/source/dom/saxbuilder.hxx
@@ -43,10 +43,6 @@
 
 namespace DOM
 {
-
-    typedef std::map< OUString, OUString > NSMap;
-    typedef std::map< OUString, OUString > AttrMap;
-
     class  CSAXDocumentBuilder
         : public ::cppu::WeakImplHelper< css::xml::dom::XSAXDocumentBuilder2, css::lang::XServiceInfo >
     {
@@ -57,7 +53,6 @@ namespace DOM
 
         css::xml::dom::SAXDocumentBuilderState m_aState;
         std::stack< css::uno::Reference< css::xml::dom::XNode > > m_aNodeStack;
-        std::stack< NSMap > m_aNSStack;
 
         css::uno::Reference< css::xml::dom::XDocument > m_aDocument;
         css::uno::Reference< css::xml::dom::XDocumentFragment > m_aFragment;
@@ -73,24 +68,28 @@ namespace DOM
         static css::uno::Reference< XInterface > _getInstance(const css::uno::Reference< css::lang::XMultiServiceFactory >& rSMgr);
 
         explicit CSAXDocumentBuilder(const css::uno::Reference< css::lang::XMultiServiceFactory >& mgr);
+        void setElementFastAttributes(const css::uno::Reference< css::xml::dom::XElement >& aElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttribs);
+
 
         // XServiceInfo
         virtual OUString SAL_CALL getImplementationName() override;
         virtual sal_Bool SAL_CALL supportsService(const OUString& ServiceName) override;
         virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames () override;
 
-        // XDocumentHandler
+        // XFastDocumentHandler
         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 processingInstruction( const OUString& rTarget, const OUString& rData ) override;
         virtual void SAL_CALL setDocumentLocator( const css::uno::Reference< css::xml::sax::XLocator >& xLocator ) override;
 
+        // XFastContextHandler
+        virtual void SAL_CALL startFastElement( sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& Attribs ) override;
+        virtual void SAL_CALL startUnknownElement( const OUString& Namespace, const OUString& Name, const css::uno::Reference< css::xml::sax::XFastAttributeList >& Attribs ) override;
+        virtual void SAL_CALL endFastElement( sal_Int32 Element ) override;
+        virtual void SAL_CALL endUnknownElement( const OUString& Namespace, const OUString& Name ) override;
+        virtual css::uno::Reference< XFastContextHandler > SAL_CALL createFastChildContext( sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& Attribs ) override;
+        virtual css::uno::Reference< XFastContextHandler > SAL_CALL createUnknownChildContext( const OUString& Namespace, const OUString& Name, const css::uno::Reference< css::xml::sax::XFastAttributeList >& Attribs ) override;
+        virtual void SAL_CALL characters( const OUString& aChars ) override;
 
         // XSAXDocumentBuilder
         virtual css::xml::dom::SAXDocumentBuilderState SAL_CALL getState() override;
diff --git a/xmloff/inc/SchXMLImport.hxx b/xmloff/inc/SchXMLImport.hxx
index 3248d4ceadbd..5b9db7bdac34 100644
--- a/xmloff/inc/SchXMLImport.hxx
+++ b/xmloff/inc/SchXMLImport.hxx
@@ -159,6 +159,9 @@ protected:
         const OUString& rLocalName,
         const css::uno::Reference< css::xml::sax::XAttributeList >& xAttrList ) override;
 
+    virtual SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
+        const ::css::uno::Reference< ::css::xml::sax::XFastAttributeList >& xAttrList ) override;
+
 public:
     SchXMLImport(
         const css::uno::Reference< css::uno::XComponentContext >& xContext,
diff --git a/xmloff/source/chart/SchXMLImport.cxx b/xmloff/source/chart/SchXMLImport.cxx
index eab97676edff..c1cdfc91d813 100644
--- a/xmloff/source/chart/SchXMLImport.cxx
+++ b/xmloff/source/chart/SchXMLImport.cxx
@@ -528,16 +528,7 @@ SvXMLImportContext *SchXMLImport::CreateDocumentContext(sal_uInt16 const nPrefix
         uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
             GetModel(), uno::UNO_QUERY);
         // mst@: right now, this seems to be not supported, so it is untested
-        if (xDPS.is()) {
-            pContext = (IsXMLToken(rLocalName, XML_DOCUMENT_META))
-                ? new SvXMLMetaDocumentContext(*this,
-                            XML_NAMESPACE_OFFICE, rLocalName,
-                            xDPS->getDocumentProperties())
-                // flat OpenDocument file format
-                : new SchXMLFlatDocContext_Impl(
-                            *maImportHelper.get(), *this, nPrefix, rLocalName,
-                            xDPS->getDocumentProperties());
-        } else {
+        if (!xDPS.is()) {
             pContext = (IsXMLToken(rLocalName, XML_DOCUMENT_META))
                 ? SvXMLImport::CreateDocumentContext(nPrefix, rLocalName, xAttrList)
                 : new SchXMLDocContext( *maImportHelper.get(), *this,
@@ -550,6 +541,36 @@ SvXMLImportContext *SchXMLImport::CreateDocumentContext(sal_uInt16 const nPrefix
     return pContext;
 }
 
+SvXMLImportContext *SchXMLImport::CreateFastContext( sal_Int32 nElement,
+        const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
+{
+    SvXMLImportContext* pContext = nullptr;
+
+    switch (nElement)
+    {
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT ):
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_META ):
+        {
+            uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
+                GetModel(), uno::UNO_QUERY);
+            // mst@: right now, this seems to be not supported, so it is untested
+            if (xDPS.is()) {
+                pContext = (nElement == XML_ELEMENT( OFFICE, XML_DOCUMENT_META ))
+                    ? new SvXMLMetaDocumentContext(*this,
+                                xDPS->getDocumentProperties())
+                    // flat OpenDocument file format
+                    : new SchXMLFlatDocContext_Impl(
+                                *maImportHelper.get(), *this, nElement,
+                                xDPS->getDocumentProperties());
+            }
+        }
+        break;
+        default:
+            pContext = new SvXMLImportContext( *this );
+    }
+    return pContext;
+}
+
 SvXMLImportContext* SchXMLImport::CreateStylesContext(
     const OUString& rLocalName,
     const Reference<xml::sax::XAttributeList>& xAttrList )
diff --git a/xmloff/source/chart/contexts.cxx b/xmloff/source/chart/contexts.cxx
index 2ddb5030cb6c..ebba9adaed70 100644
--- a/xmloff/source/chart/contexts.cxx
+++ b/xmloff/source/chart/contexts.cxx
@@ -77,6 +77,18 @@ SchXMLDocContext::SchXMLDocContext( SchXMLImportHelper& rImpHelper,
           !IsXMLToken( rLName, XML_DOCUMENT_CONTENT) ), "xmloff.chart", "SchXMLDocContext instantiated with no <office:document> element" );
 }
 
+SchXMLDocContext::SchXMLDocContext( SchXMLImportHelper& rImpHelper,
+                                    SvXMLImport& rImport,
+                                    sal_Int32 nElement ) :
+        SvXMLImportContext( rImport ),
+        mrImportHelper( rImpHelper )
+{
+    SAL_WARN_IF(( nElement != XML_ELEMENT( OFFICE, XML_DOCUMENT ) &&
+          nElement != XML_ELEMENT( OFFICE, XML_DOCUMENT_META ) &&
+          nElement != XML_ELEMENT( OFFICE, XML_DOCUMENT_STYLES ) &&
+          nElement != XML_ELEMENT( OFFICE, XML_DOCUMENT_CONTENT ) ), "xmloff.chart", "SchXMLDocContext instantiated with no <office:document> element" );
+}
+
 SchXMLDocContext::~SchXMLDocContext()
 {}
 
@@ -122,31 +134,33 @@ SvXMLImportContextRef SchXMLDocContext::CreateChildContext(
     return xContext;
 }
 
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SchXMLDocContext::createFastChildContext(
+    sal_Int32 /*nElement*/, const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
+{
+    return new SvXMLImportContext( GetImport() );
+}
+
 SchXMLFlatDocContext_Impl::SchXMLFlatDocContext_Impl(
         SchXMLImportHelper& i_rImpHelper,
         SchXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
+        sal_Int32 i_nElement,
         const uno::Reference<document::XDocumentProperties>& i_xDocProps) :
-    SvXMLImportContext(i_rImport, i_nPrefix, i_rLName),
-    SchXMLDocContext(i_rImpHelper, i_rImport, i_nPrefix, i_rLName),
-    SvXMLMetaDocumentContext(i_rImport, i_nPrefix, i_rLName,
-        i_xDocProps)
+    SvXMLImportContext(i_rImport),
+    SchXMLDocContext(i_rImpHelper, i_rImport, i_nElement),
+    SvXMLMetaDocumentContext(i_rImport, i_xDocProps)
 {
 }
 
-SvXMLImportContextRef SchXMLFlatDocContext_Impl::CreateChildContext(
-    sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-    const uno::Reference<xml::sax::XAttributeList>& i_xAttrList)
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SchXMLFlatDocContext_Impl::createFastChildContext(
+    sal_Int32 nElement, const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
     // behave like meta base class iff we encounter office:meta
-    const SvXMLTokenMap& rTokenMap =
-        mrImportHelper.GetDocElemTokenMap();
-    if ( XML_TOK_DOC_META == rTokenMap.Get( i_nPrefix, i_rLocalName ) ) {
-        return SvXMLMetaDocumentContext::CreateChildContext(
-                    i_nPrefix, i_rLocalName, i_xAttrList );
+    if ( nElement == XML_ELEMENT( OFFICE, XML_META ) ) {
+        return SvXMLMetaDocumentContext::createFastChildContext(
+                    nElement, xAttrList );
     } else {
-        return SchXMLDocContext::CreateChildContext(
-                    i_nPrefix, i_rLocalName, i_xAttrList );
+        return SchXMLDocContext::createFastChildContext(
+                    nElement, xAttrList );
     }
 }
 
diff --git a/xmloff/source/chart/contexts.hxx b/xmloff/source/chart/contexts.hxx
index 9820cd3b76e4..c2980d800682 100644
--- a/xmloff/source/chart/contexts.hxx
+++ b/xmloff/source/chart/contexts.hxx
@@ -47,13 +47,21 @@ public:
         SvXMLImport& rImport,
         sal_uInt16 nPrefix,
         const OUString& rLName );
-    virtual ~SchXMLDocContext() override;
 
+    SchXMLDocContext(
+        SchXMLImportHelper& rImpHelper,
+        SvXMLImport& rImport,
+        sal_Int32 nElement );
+
+    virtual ~SchXMLDocContext() override;
 
     virtual SvXMLImportContextRef CreateChildContext(
         sal_uInt16 nPrefix,
         const OUString& rLocalName,
         const css::uno::Reference< css::xml::sax::XAttributeList >& xAttrList ) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 };
 
 // context for flat file xml format
@@ -64,12 +72,11 @@ public:
     SchXMLFlatDocContext_Impl(
         SchXMLImportHelper& i_rImpHelper,
         SchXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
+        sal_Int32 i_nElement,
         const css::uno::Reference<css::document::XDocumentProperties>& i_xDocProps);
 
-    virtual SvXMLImportContextRef CreateChildContext(
-        sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-        const css::uno::Reference<css::xml::sax::XAttributeList>& i_xAttrList) override;
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 };
 
 class SchXMLBodyContext : public SvXMLImportContext
diff --git a/xmloff/source/core/XMLEmbeddedObjectImportContext.cxx b/xmloff/source/core/XMLEmbeddedObjectImportContext.cxx
index a90ec6b643bc..bfa90235b40b 100644
--- a/xmloff/source/core/XMLEmbeddedObjectImportContext.cxx
+++ b/xmloff/source/core/XMLEmbeddedObjectImportContext.cxx
@@ -116,6 +116,9 @@ void XMLEmbeddedObjectImportContext::SetComponent( Reference< XComponent > const
     if( !xHandler.is() )
         return;
 
+    if (SvXMLImport *pFastHandler = dynamic_cast<SvXMLImport*>(xHandler.get()))
+        xHandler.set( new SvXMLLegacyToFastDocHandler( pFastHandler ) );
+
     try
     {
         Reference < XModifiable2 > xModifiable2( rComp, UNO_QUERY_THROW );
diff --git a/xmloff/source/core/xmlimp.cxx b/xmloff/source/core/xmlimp.cxx
index b92d5edc64c1..ba656fe41131 100644
--- a/xmloff/source/core/xmlimp.cxx
+++ b/xmloff/source/core/xmlimp.cxx
@@ -80,6 +80,7 @@ using namespace ::xmloff::token;
 
 css::uno::Reference< css::xml::sax::XFastTokenHandler > SvXMLImport::xTokenHandler( new FastTokenHandler() );
 std::unordered_map< sal_Int32, std::pair< OUString, OUString > > SvXMLImport::aNamespaceMap;
+std::unordered_map< OUString, OUString, OUStringHash > SvXMLImport::aNamespaceURIPrefixMap;
 const OUString SvXMLImport::aDefaultNamespace = OUString("");
 const OUString SvXMLImport::aNamespaceSeparator = OUString(":");
 bool SvXMLImport::bIsNSMapsInitialized = false;
@@ -1125,6 +1126,11 @@ void SAL_CALL SvXMLImport::initialize( const uno::Sequence< uno::Any >& aArgumen
             }
         }
     }
+
+    uno::Reference<lang::XInitialization> const xInit(mxParser, uno::UNO_QUERY_THROW);
+    uno::Sequence<uno::Any> args(1);
+    args[0] <<= OUString("IgnoreMissingNSDecl");
+    xInit->initialize( args );
 }
 
 // XServiceInfo
@@ -2062,14 +2068,35 @@ const OUString SvXMLImport::getNamespacePrefixFromToken( sal_Int32 nToken )
         return OUString();
 }
 
+const OUString SvXMLImport::getNamespaceURIFromToken( sal_Int32 nToken )
+{
+    sal_Int32 nNamespaceToken = ( nToken & NMSP_MASK ) >> NMSP_SHIFT;
+    auto aIter( aNamespaceMap.find( nNamespaceToken ) );
+    if( aIter != aNamespaceMap.end() )
+        return (*aIter).second.second;
+    else
+        return OUString();
+}
+
+const OUString SvXMLImport::getNamespacePrefixFromURI( const OUString& rURI )
+{
+    auto aIter( aNamespaceURIPrefixMap.find(rURI) );
+    if( aIter != aNamespaceURIPrefixMap.end() )
+        return (*aIter).second;
+    else
+        return OUString();
+}
+
 void SvXMLImport::initializeNamespaceMaps()
 {
     auto mapTokenToNamespace = [&]( sal_Int32 nToken, sal_Int32 nPrefix, sal_Int32 nNamespace )
     {
         if ( nToken >= 0 )
         {
-            aNamespaceMap[ nToken + 1 ] = std::make_pair( GetXMLToken( static_cast<XMLTokenEnum>( nPrefix ) ),
-                                                      GetXMLToken( static_cast<XMLTokenEnum>( nNamespace ) ) );
+            const OUString& sNamespace = GetXMLToken( static_cast<XMLTokenEnum>( nNamespace ) );
+            const OUString& sPrefix = GetXMLToken( static_cast<XMLTokenEnum>( nPrefix ) );
+            aNamespaceMap[ nToken + 1 ] = std::make_pair( sPrefix, sNamespace );
+            aNamespaceURIPrefixMap.emplace( sNamespace, sPrefix );
         }
     };
 
@@ -2180,6 +2207,12 @@ void SvXMLImportFastNamespaceHandler::addNSDeclAttributes( rtl::Reference < comp
 
 void SvXMLImportFastNamespaceHandler::registerNamespace( const OUString& rNamespacePrefix, const OUString& rNamespaceURI )
 {
+    // Elements with default namespace parsed by FastParser have namepsace prefix.
+    // A default namespace needs to be registered with the prefix, to maintan the compatibility.
+    if ( rNamespacePrefix.isEmpty() )
+        m_aNamespaceDefines.push_back( o3tl::make_unique<NamespaceDefine>(
+                                    SvXMLImport::getNamespacePrefixFromURI( rNamespaceURI ), rNamespaceURI) );
+
     m_aNamespaceDefines.push_back( o3tl::make_unique<NamespaceDefine>(
                                     rNamespacePrefix, rNamespaceURI) );
 }
diff --git a/xmloff/source/draw/sdxmlimp.cxx b/xmloff/source/draw/sdxmlimp.cxx
index 3d5e91ea814e..2430ff381a13 100644
--- a/xmloff/source/draw/sdxmlimp.cxx
+++ b/xmloff/source/draw/sdxmlimp.cxx
@@ -90,23 +90,26 @@ protected:
     SdXMLImport& GetSdImport() { return static_cast<SdXMLImport&>(GetImport()); }
 
 public:
-    SdXMLDocContext_Impl(
-        SdXMLImport& rImport,
-        sal_uInt16 nPrfx,
-        const OUString& rLName,
-        const uno::Reference<xml::sax::XAttributeList>& xAttrList);
+    SdXMLDocContext_Impl( SdXMLImport& rImport );
 
     virtual SvXMLImportContextRef CreateChildContext(sal_uInt16 nPrefix,
         const OUString& rLocalName,
         const uno::Reference<xml::sax::XAttributeList>& xAttrList) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
+
+    virtual void SAL_CALL characters( const OUString& /*aChars*/ ) override {}
+
+    virtual void SAL_CALL startFastElement( sal_Int32 /*nElement*/,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& /*xAttrList*/ ) override {}
+
+    virtual void SAL_CALL endFastElement( sal_Int32 /*nElement*/ ) override {}
 };
 
 SdXMLDocContext_Impl::SdXMLDocContext_Impl(
-    SdXMLImport& rImport,
-    sal_uInt16 nPrfx,
-    const OUString& rLName,
-    const uno::Reference<xml::sax::XAttributeList>&)
-:   SvXMLImportContext(rImport, nPrfx, rLName)
+    SdXMLImport& rImport )
+:   SvXMLImportContext(rImport)
 {
 }
 
@@ -193,44 +196,65 @@ SvXMLImportContextRef SdXMLDocContext_Impl::CreateChildContext(
     return xContext;
 }
 
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SdXMLDocContext_Impl::createFastChildContext(
+    sal_Int32 /*nElement*/, const uno::Reference< xml::sax::XFastAttributeList >& /*xAttrList*/ )
+{
+    return new SvXMLImportContext( GetImport() );
+}
+
 // context for flat file xml format
 class SdXMLFlatDocContext_Impl
     : public SdXMLDocContext_Impl, public SvXMLMetaDocumentContext
 {
 public:
     SdXMLFlatDocContext_Impl( SdXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
-        const uno::Reference<xml::sax::XAttributeList>& i_xAttrList,
-        const uno::Reference<document::XDocumentProperties>& i_xDocProps);
+        const uno::Reference<document::XDocumentProperties>& i_xDocProps );
 
-    virtual SvXMLImportContextRef CreateChildContext(
-        sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-        const uno::Reference<xml::sax::XAttributeList>& i_xAttrList) override;
+    virtual void SAL_CALL startFastElement( sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
+
+    virtual void SAL_CALL endFastElement( sal_Int32 nElement ) override;
+
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 };
 
 SdXMLFlatDocContext_Impl::SdXMLFlatDocContext_Impl( SdXMLImport& i_rImport,
-        sal_uInt16 i_nPrefix, const OUString & i_rLName,
-        const uno::Reference<xml::sax::XAttributeList>& i_xAttrList,
         const uno::Reference<document::XDocumentProperties>& i_xDocProps) :
-    SvXMLImportContext(i_rImport, i_nPrefix, i_rLName),
-    SdXMLDocContext_Impl(i_rImport, i_nPrefix, i_rLName, i_xAttrList),
-    SvXMLMetaDocumentContext(i_rImport, i_nPrefix, i_rLName,
-        i_xDocProps)
+    SvXMLImportContext(i_rImport),
+    SdXMLDocContext_Impl(i_rImport),
+    SvXMLMetaDocumentContext(i_rImport, i_xDocProps)
+{
+}
+
+void SAL_CALL SdXMLFlatDocContext_Impl::startFastElement( sal_Int32 nElement,
+    const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
+{
+    SvXMLMetaDocumentContext::startFastElement(nElement, xAttrList);
+}
+
+void SAL_CALL SdXMLFlatDocContext_Impl::endFastElement( sal_Int32 nElement )
+{
+    SvXMLMetaDocumentContext::endFastElement(nElement);
+}
+
+void SAL_CALL SdXMLFlatDocContext_Impl::characters( const OUString& rChars )
 {
+    SvXMLMetaDocumentContext::characters(rChars);
 }
 
-SvXMLImportContextRef SdXMLFlatDocContext_Impl::CreateChildContext(
-    sal_uInt16 i_nPrefix, const OUString& i_rLocalName,
-    const uno::Reference<xml::sax::XAttributeList>& i_xAttrList)
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SdXMLFlatDocContext_Impl::createFastChildContext(
+    sal_Int32 nElement, const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
     // behave like meta base class iff we encounter office:meta
-    const SvXMLTokenMap& rTokenMap = GetSdImport().GetDocElemTokenMap();
-    if ( XML_TOK_DOC_META == rTokenMap.Get( i_nPrefix, i_rLocalName ) ) {
-        return SvXMLMetaDocumentContext::CreateChildContext(
-                    i_nPrefix, i_rLocalName, i_xAttrList );
+    if ( nElement == XML_ELEMENT( OFFICE, XML_META ) ) {
+        return SvXMLMetaDocumentContext::createFastChildContext(
+                    nElement, xAttrList );
     } else {
-        return SdXMLDocContext_Impl::CreateChildContext(
-                    i_nPrefix, i_rLocalName, i_xAttrList );
+        return SdXMLDocContext_Impl::createFastChildContext(
+                    nElement, xAttrList );
     }
 }
 
@@ -584,37 +608,37 @@ const SvXMLTokenMap& SdXMLImport::GetPresentationPlaceholderAttrTokenMap()
     return *mpPresentationPlaceholderAttrTokenMap;
 }
 
-SvXMLImportContext *SdXMLImport::CreateDocumentContext(sal_uInt16 nPrefix,
-    const OUString& rLocalName,
-    const uno::Reference<xml::sax::XAttributeList>& xAttrList)
+SvXMLImportContext *SdXMLImport::CreateFastContext( sal_Int32 nElement,
+        const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
     SvXMLImportContext* pContext = nullptr;
 
-    if(XML_NAMESPACE_OFFICE == nPrefix &&
-        ( IsXMLToken( rLocalName, XML_DOCUMENT_STYLES ) ||
-          IsXMLToken( rLocalName, XML_DOCUMENT_CONTENT ) ||
-          IsXMLToken( rLocalName, XML_DOCUMENT_SETTINGS )   ))
+    switch (nElement)
     {
-         pContext = new SdXMLDocContext_Impl(*this, nPrefix, rLocalName, xAttrList);
-    } else if ( (XML_NAMESPACE_OFFICE == nPrefix) &&
-                ( IsXMLToken(rLocalName, XML_DOCUMENT_META)) ) {
-        pContext = CreateMetaContext(rLocalName, xAttrList);
-    } else if ( (XML_NAMESPACE_OFFICE == nPrefix) &&
-                ( IsXMLToken(rLocalName, XML_DOCUMENT)) ) {
-        uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
-            GetModel(), uno::UNO_QUERY_THROW);
-        // flat OpenDocument file format
-        pContext = new SdXMLFlatDocContext_Impl( *this, nPrefix, rLocalName,
-                        xAttrList, xDPS->getDocumentProperties());
-    } else {
-        pContext = SvXMLImport::CreateDocumentContext(nPrefix, rLocalName, xAttrList);
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_STYLES ):
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_CONTENT ):
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_SETTINGS ):
+            pContext = new SdXMLDocContext_Impl(*this);
+        break;
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT_META ):
+            pContext = CreateMetaContext(nElement, xAttrList);
+        break;
+        case XML_ELEMENT( OFFICE, XML_DOCUMENT ):
+        {
+            uno::Reference<document::XDocumentPropertiesSupplier> xDPS(
+                GetModel(), uno::UNO_QUERY_THROW);
+            // flat OpenDocument file format
+            pContext = new SdXMLFlatDocContext_Impl( *this, xDPS->getDocumentProperties());
+        }
+        break;
+        default:
+            pContext = SvXMLImport::CreateFastContext(nElement, xAttrList);
     }
-
     return pContext;
 }
 
-SvXMLImportContext *SdXMLImport::CreateMetaContext(const OUString& rLocalName,
-    const uno::Reference<xml::sax::XAttributeList>&)
+SvXMLImportContext *SdXMLImport::CreateMetaContext(const sal_Int32 /*nElement*/,
+    const uno::Reference<xml::sax::XFastAttributeList>&)
 {
     SvXMLImportContext* pContext = nullptr;
 
@@ -624,14 +648,12 @@ SvXMLImportContext *SdXMLImport::CreateMetaContext(const OUString& rLocalName,
             GetModel(), uno::UNO_QUERY_THROW);
         uno::Reference<document::XDocumentProperties> const xDocProps(
             !mbLoadDoc ? nullptr : xDPS->getDocumentProperties());
-        pContext = new SvXMLMetaDocumentContext(*this,
-                        XML_NAMESPACE_OFFICE, rLocalName,
-                        xDocProps);
+        pContext = new SvXMLMetaDocumentContext(*this, xDocProps);
     }
 
     if(!pContext)
     {
-        pContext = new SvXMLImportContext(*this, XML_NAMESPACE_OFFICE, rLocalName);
+        pContext = new SvXMLImportContext(*this);
     }
 
     return pContext;
diff --git a/xmloff/source/draw/sdxmlimp_impl.hxx b/xmloff/source/draw/sdxmlimp_impl.hxx
index 3900aa02aaf4..7b029895c766 100644
--- a/xmloff/source/draw/sdxmlimp_impl.hxx
+++ b/xmloff/source/draw/sdxmlimp_impl.hxx
@@ -176,9 +176,10 @@ class SdXMLImport: public SvXMLImport
 
 protected:
 
-    virtual SvXMLImportContext *CreateDocumentContext(sal_uInt16 nPrefix,
-      const OUString& rLocalName,
-      const css::uno::Reference< css::xml::sax::XAttributeList>& xAttrList) override;
+    // This method is called after the namespace map has been updated, but
+    // before a context for the current element has been pushed.
+    virtual SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
+        const ::css::uno::Reference< ::css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
 public:
     SdXMLImport(
@@ -198,8 +199,8 @@ public:
     // namespace office
     // NB: in contrast to other CreateFooContexts, this particular one handles
     //     the root element (i.e. office:document-meta)
-    SvXMLImportContext* CreateMetaContext(const OUString& rLocalName,
-        const css::uno::Reference< css::xml::sax::XAttributeList >& xAttrList);
+    SvXMLImportContext* CreateMetaContext(const sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList);
     SvXMLImportContext* CreateScriptContext( const OUString& rLocalName );
     SvXMLImportContext* CreateBodyContext(const OUString& rLocalName,
         const css::uno::Reference< css::xml::sax::XAttributeList >& xAttrList);
diff --git a/xmloff/source/meta/MetaImportComponent.cxx b/xmloff/source/meta/MetaImportComponent.cxx
index d10d9c8f9bd0..6f5d7c0d1a5f 100644
--- a/xmloff/source/meta/MetaImportComponent.cxx
+++ b/xmloff/source/meta/MetaImportComponent.cxx
@@ -43,10 +43,8 @@ public:
 
 protected:
 
-    virtual SvXMLImportContext* CreateDocumentContext(
-        sal_uInt16 nPrefix,
-        const OUString& rLocalName,
-        const css::uno::Reference< css::xml::sax::XAttributeList > & xAttrList ) override;
+    virtual SvXMLImportContext *CreateFastContext( sal_Int32 nElement,
+        const ::css::uno::Reference< ::css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
     // XImporter
     virtual void SAL_CALL setTargetDocument( const css::uno::Reference< css::lang::XComponent >& xDoc ) override;
@@ -68,25 +66,22 @@ XMLMetaImportComponent::XMLMetaImportComponent(
 {
 }
 
-SvXMLImportContext* XMLMetaImportComponent::CreateDocumentContext(
-    sal_uInt16 nPrefix,
-    const OUString& rLocalName,
-    const uno::Reference<xml::sax::XAttributeList > & xAttrList )
+SvXMLImportContext *XMLMetaImportComponent::CreateFastContext( sal_Int32 nElement,
+        const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
-    if (  (XML_NAMESPACE_OFFICE == nPrefix) &&
-         IsXMLToken(rLocalName, XML_DOCUMENT_META) )
+    if (nElement == XML_ELEMENT( OFFICE, XML_DOCUMENT_META ))
     {
         if (!mxDocProps.is()) {
             throw uno::RuntimeException(
-                "XMLMetaImportComponent::CreateContext: setTargetDocument "
+                "XMLMetaImportComponent::CreateFastContext: setTargetDocument "
                 "has not been called", *this);
         }
         return new SvXMLMetaDocumentContext(
-                        *this, nPrefix, rLocalName, mxDocProps);
+                        *this, mxDocProps);
     }
     else
     {
-        return SvXMLImport::CreateDocumentContext(nPrefix, rLocalName, xAttrList);
+        return SvXMLImport::CreateFastContext(nElement, xAttrList);
     }
 }
 
diff --git a/xmloff/source/meta/xmlmetai.cxx b/xmloff/source/meta/xmlmetai.cxx
index 1f9a1b9604e2..10f60b7717dd 100644
--- a/xmloff/source/meta/xmlmetai.cxx
+++ b/xmloff/source/meta/xmlmetai.cxx
@@ -41,57 +41,66 @@ private:
     css::uno::Reference< css::xml::dom::XSAXDocumentBuilder2> mxDocBuilder;
 
 public:
-    XMLDocumentBuilderContext(SvXMLImport& rImport, sal_uInt16 nPrfx,
-        const OUString& rLName,
-        const css::uno::Reference< css::xml::sax::XAttributeList>& xAttrList,
+    XMLDocumentBuilderContext(SvXMLImport& rImport, sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList>& xAttrList,
         const css::uno::Reference< css::xml::dom::XSAXDocumentBuilder2>& rDocBuilder);
 
-    virtual SvXMLImportContextRef CreateChildContext( sal_uInt16 nPrefix,
-        const OUString& rLocalName,
-        const css::uno::Reference< css::xml::sax::XAttributeList>& xAttrList ) override;
+    virtual void SAL_CALL characters( const OUString& aChars ) override;
 
-    virtual void StartElement( const css::uno::Reference< css::xml::sax::XAttributeList >& xAttrList ) override;
+    virtual void SAL_CALL startFastElement( sal_Int32 nElement,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
-    virtual void Characters( const OUString& rChars ) override;
+    virtual void SAL_CALL endFastElement( sal_Int32 nElement ) override;
+
+    virtual void SAL_CALL startUnknownElement( const OUString& Namespace, const OUString& Name,
+        const css::uno::Reference< css::xml::sax::XFastAttributeList >& Attribs ) override;
+
+    virtual void SAL_CALL endUnknownElement( const OUString& Namespace, const OUString& Name ) override;
+
+    virtual css::uno::Reference< css::xml::sax::XFastContextHandler > SAL_CALL createFastChildContext(
+        sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttrList ) override;
 
-    virtual void EndElement() override;
 };
 
 XMLDocumentBuilderContext::XMLDocumentBuilderContext(SvXMLImport& rImport,
-        sal_uInt16 nPrfx, const OUString& rLName,
-        const uno::Reference<xml::sax::XAttributeList>&,
+        sal_Int32 /*nElement*/, const uno::Reference<xml::sax::XFastAttributeList>&,
         const uno::Reference<xml::dom::XSAXDocumentBuilder2>& rDocBuilder) :
-    SvXMLImportContext( rImport, nPrfx, rLName ),
+    SvXMLImportContext( rImport ),
     mxDocBuilder(rDocBuilder)
 {
 }
 
-SvXMLImportContextRef
-XMLDocumentBuilderContext::CreateChildContext( sal_uInt16 nPrefix,
-    const OUString& rLocalName,
-    const uno::Reference< xml::sax::XAttributeList>& rAttrs)
+void SAL_CALL XMLDocumentBuilderContext::startFastElement( sal_Int32 nElement,
+        const uno::Reference< xml::sax::XFastAttributeList >& xAttribs )
+{
+    mxDocBuilder->startFastElement(nElement, xAttribs);
+}
+
+void SAL_CALL XMLDocumentBuilderContext::endFastElement( sal_Int32 nElement )
+{
+    mxDocBuilder->endFastElement(nElement);
+}
+
+void SAL_CALL XMLDocumentBuilderContext::startUnknownElement( const OUString& rNamespace,
+        const OUString& rName, const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
-    return new XMLDocumentBuilderContext(
-                GetImport(), nPrefix, rLocalName, rAttrs, mxDocBuilder);
+    mxDocBuilder->startUnknownElement(rNamespace, rName, xAttrList);
 }
 
-void XMLDocumentBuilderContext::StartElement(
-    const uno::Reference< xml::sax::XAttributeList >& xAttrList )
+void SAL_CALL XMLDocumentBuilderContext::endUnknownElement( const OUString& rNamespace, const OUString& rName )
 {
-    mxDocBuilder->startElement(
-      GetImport().GetNamespaceMap().GetQNameByKey(GetPrefix(), GetLocalName()),
-      xAttrList);
+    mxDocBuilder->endUnknownElement(rNamespace, rName);
 }
 
-void XMLDocumentBuilderContext::Characters( const OUString& rChars )
+void SAL_CALL XMLDocumentBuilderContext::characters( const OUString& rChars )
 {
     mxDocBuilder->characters(rChars);
 }
 
-void XMLDocumentBuilderContext::EndElement()
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL XMLDocumentBuilderContext::createFastChildContext(
+    sal_Int32 nElement, const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
-    mxDocBuilder->endElement(
-      GetImport().GetNamespaceMap().GetQNameByKey(GetPrefix(), GetLocalName()));
+    return new XMLDocumentBuilderContext( GetImport(), nElement, xAttrList, mxDocBuilder );
 }
 
 static void
@@ -150,19 +159,6 @@ lcl_initGenerator(SvXMLImport & rImport,
 }
 
 SvXMLMetaDocumentContext::SvXMLMetaDocumentContext(SvXMLImport& rImport,
-            sal_uInt16 nPrfx, const OUString& rLName,
-            const uno::Reference<document::XDocumentProperties>& xDocProps) :
-    SvXMLImportContext( rImport, nPrfx, rLName ),
-    mxDocProps(xDocProps),
-    mxDocBuilder(
-        xml::dom::SAXDocumentBuilder::create(
-            comphelper::getProcessComponentContext()))
-{
-// #i103539#: must always read meta.xml for generator, xDocProps unwanted then
-//    OSL_ENSURE(xDocProps.is(), "SvXMLMetaDocumentContext: no document props");
-}
-
-SvXMLMetaDocumentContext::SvXMLMetaDocumentContext(SvXMLImport& rImport,
             const uno::Reference<document::XDocumentProperties>& xDocProps) :
     SvXMLImportContext( rImport ),
     mxDocProps(xDocProps),
@@ -178,39 +174,18 @@ SvXMLMetaDocumentContext::~SvXMLMetaDocumentContext()
 {
 }
 
-SvXMLImportContextRef SvXMLMetaDocumentContext::CreateChildContext(
-             sal_uInt16 nPrefix, const OUString& rLocalName,
-             const uno::Reference<xml::sax::XAttributeList>& rAttrs)
-{
-    if (  (XML_NAMESPACE_OFFICE == nPrefix) &&
-         IsXMLToken(rLocalName, XML_META) )
-    {
-        return new XMLDocumentBuilderContext(
-                GetImport(), nPrefix, rLocalName, rAttrs, mxDocBuilder);
-    }
-    else
-    {
-        return new SvXMLImportContext( GetImport(), nPrefix, rLocalName );
-    }
-}
-
-void SvXMLMetaDocumentContext::StartElement(
-    const uno::Reference< xml::sax::XAttributeList >& xAttrList )
+void SAL_CALL SvXMLMetaDocumentContext::startFastElement( sal_Int32 nElement,
+            const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
 {
     mxDocBuilder->startDocument();
     // hardcode office:document-meta (necessary in case of flat file ODF)
-    mxDocBuilder->startElement(
-        GetImport().GetNamespaceMap().GetQNameByKey(GetPrefix(),
-            GetXMLToken(XML_DOCUMENT_META)), xAttrList);
-
+    mxDocBuilder->startFastElement( ( nElement & NMSP_MASK ) | XML_DOCUMENT_META, xAttrList );
 }
 
-void SvXMLMetaDocumentContext::EndElement()
+void SAL_CALL SvXMLMetaDocumentContext::endFastElement( sal_Int32 nElement )
 {
     // hardcode office:document-meta (necessary in case of flat file ODF)
-    mxDocBuilder->endElement(
-        GetImport().GetNamespaceMap().GetQNameByKey(GetPrefix(),
-            GetXMLToken(XML_DOCUMENT_META)));
+    mxDocBuilder->endFastElement( ( nElement & NMSP_MASK ) | XML_DOCUMENT_META );
     mxDocBuilder->endDocument();
     if (mxDocProps.is())
     {
@@ -222,6 +197,20 @@ void SvXMLMetaDocumentContext::EndElement()
     }
 }
 
+void SAL_CALL SvXMLMetaDocumentContext::characters( const OUString& /*rChars*/ )
+{
+}
+
+uno::Reference< xml::sax::XFastContextHandler > SAL_CALL SvXMLMetaDocumentContext::createFastChildContext(
+    sal_Int32 nElement, const uno::Reference< xml::sax::XFastAttributeList >& xAttrList )
+{
+    if ( nElement == ( NAMESPACE_TOKEN( XML_NAMESPACE_OFFICE ) | XML_META ) )
+        return new XMLDocumentBuilderContext(
+                GetImport(), nElement, xAttrList, mxDocBuilder);
+    else
+        return new SvXMLImportContext( GetImport() );
+}
+
 void SvXMLMetaDocumentContext::setBuildId(OUString const& i_rBuildId, const uno::Reference<beans::XPropertySet>& xImportInfo )
 {
     OUString sBuildId;