use string_view in ProcessAttribute

Change-Id: I81feb01bf6823d1d8fb5a7da08490959484ef533
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108095
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

8 files changed, 395 insertions, 171 deletions

diff --git a/include/sax/tools/converter.hxx b/include/sax/tools/converter.hxx
index 07c2fb3207b1..0d3d68ba301c 100644
--- a/include/sax/tools/converter.hxx
+++ b/include/sax/tools/converter.hxx
@@ -206,6 +206,10 @@ public:
     static bool convertDuration(double & rfTime,
                                 std::u16string_view rString);
 
+    /** convert XMLSchema-2 "duration" string to double; negative durations allowed */
+    static bool convertDuration(double & rfTime,
+                                std::string_view rString);
+
     /** convert XMLSchema-2 "duration" string to util::Duration */
     static bool convertDuration(css::util::Duration& rDuration,
                         std::u16string_view rString);
@@ -229,10 +233,18 @@ public:
     static bool parseDateTime( css::util::DateTime& rDateTime,
                                std::u16string_view rString );
 
+    /** convert XMLSchema-2 "date" or "dateTime" string to util::DateTime */
+    static bool parseDateTime( css::util::DateTime& rDateTime,
+                               std::string_view rString );
+
     /** convert XMLSchema-2 "time" or "dateTime" string to util::DateTime */
     static bool parseTimeOrDateTime(css::util::DateTime& rDateTime,
                                  std::u16string_view rString);
 
+    /** convert XMLSchema-2 "time" or "dateTime" string to util::DateTime */
+    static bool parseTimeOrDateTime(css::util::DateTime& rDateTime,
+                                 std::string_view rString);
+
     /** convert XMLSchema-2 "date" or "dateTime" string to util::DateTime or
         util::Date */
     static bool parseDateOrDateTime(
@@ -242,6 +254,15 @@ public:
                     std::optional<sal_Int16> * pTimeZoneOffset,
                     std::u16string_view rString );
 
+    /** convert XMLSchema-2 "date" or "dateTime" string to util::DateTime or
+        util::Date */
+    static bool parseDateOrDateTime(
+                    css::util::Date * pDate,
+                    css::util::DateTime & rDateTime,
+                    bool & rbDateTime,
+                    std::optional<sal_Int16> * pTimeZoneOffset,
+                    std::string_view rString );
+
     /** gets the position of the first comma after npos in the string
         rStr. Commas inside '"' pairs are not matched */
     static sal_Int32 indexOfComma( std::u16string_view rStr,
diff --git a/include/xmloff/xmluconv.hxx b/include/xmloff/xmluconv.hxx
index 87d2e883be36..a501221c16bb 100644
--- a/include/xmloff/xmluconv.hxx
+++ b/include/xmloff/xmluconv.hxx
@@ -228,6 +228,10 @@ public:
     bool convertDateTime(double& fDateTime,
                          std::u16string_view rString);
 
+    /** convert ISO Date Time String to double */
+    bool convertDateTime(double& fDateTime,
+                         std::string_view rString);
+
     /// these 2 functions use tools Date, so they're not yet moved to sax
 
     /** convert double to ISO Date Time String */
@@ -239,6 +243,10 @@ public:
     static bool convertDateTime( double& fDateTime,
                                 std::u16string_view rString,
                                 const css::util::Date& aNullDate);
+    /** convert ISO Date Time String to double */
+    static bool convertDateTime( double& fDateTime,
+                                std::string_view rString,
+                                const css::util::Date& aNullDate);
 
 
     /** convert string to ::basegfx::B3DVector */
diff --git a/sax/source/tools/converter.cxx b/sax/source/tools/converter.cxx
index a4a793c0392e..57cbceaaca7c 100644
--- a/sax/source/tools/converter.cxx
+++ b/sax/source/tools/converter.cxx
@@ -282,7 +282,7 @@ bool Converter::convertMeasure( sal_Int32& rValue,
                                 sal_Int32 nMin /* = SAL_MIN_INT32 */,
                                 sal_Int32 nMax /* = SAL_MAX_INT32 */ )
 {
-    return lcl_convertMeasure<std::u16string_view>(rValue, rString, nTargetUnit, nMin, nMax);
+    return lcl_convertMeasure(rValue, rString, nTargetUnit, nMin, nMax);
 }
 
 /** convert string to measure using optional min and max values*/
@@ -292,7 +292,7 @@ bool Converter::convertMeasure( sal_Int32& rValue,
                                 sal_Int32 nMin /* = SAL_MIN_INT32 */,
                                 sal_Int32 nMax /* = SAL_MAX_INT32 */ )
 {
-    return lcl_convertMeasure<std::string_view>(rValue, rString, nTargetUnit, nMin, nMax);
+    return lcl_convertMeasure(rValue, rString, nTargetUnit, nMin, nMax);
 }
 
 
@@ -549,13 +549,13 @@ static bool lcl_convertColor( sal_Int32& rColor, V rValue )
 /** convert string to rgb color */
 bool Converter::convertColor( sal_Int32& rColor, std::u16string_view rValue )
 {
-    return lcl_convertColor<std::u16string_view>(rColor, rValue);
+    return lcl_convertColor(rColor, rValue);
 }
 
 /** convert string to rgb color */
 bool Converter::convertColor( sal_Int32& rColor, std::string_view rValue )
 {
-    return lcl_convertColor<std::string_view>(rColor, rValue);
+    return lcl_convertColor(rColor, rValue);
 }
 
 const char aHexTab[] = "0123456789abcdef";
@@ -647,7 +647,7 @@ bool Converter::convertNumber64( sal_Int64& rValue,
                                  std::u16string_view aString,
                                  sal_Int64 nMin, sal_Int64 nMax )
 {
-    return lcl_convertNumber64<std::u16string_view>(rValue, aString, nMin, nMax);
+    return lcl_convertNumber64(rValue, aString, nMin, nMax);
 }
 
 /** convert string to 64-bit number with optional min and max values */
@@ -655,7 +655,7 @@ bool Converter::convertNumber64( sal_Int64& rValue,
                                  std::string_view aString,
                                  sal_Int64 nMin, sal_Int64 nMax )
 {
-    return lcl_convertNumber64<std::string_view>(rValue, aString, nMin, nMax);
+    return lcl_convertNumber64(rValue, aString, nMin, nMax);
 }
 
 
@@ -930,6 +930,19 @@ static std::u16string_view trim(std::u16string_view in) {
   return std::u16string_view(&*left, std::distance(left, right) + 1);
 }
 
+static std::string_view trim(std::string_view in) {
+  auto left = in.begin();
+  for (;; ++left) {
+    if (left == in.end())
+      return std::string_view();
+    if (!isspace(*left))
+      break;
+  }
+  auto right = in.end() - 1;
+  for (; right > left && isspace(*right); --right);
+  return std::string_view(&*left, std::distance(left, right) + 1);
+}
+
 /** convert ISO "duration" string to double; negative durations allowed */
 bool Converter::convertDuration(double& rfTime,
                                 std::u16string_view rString)
@@ -1058,6 +1071,134 @@ bool Converter::convertDuration(double& rfTime,
     return bSuccess;
 }
 
+/** convert ISO "duration" string to double; negative durations allowed */
+bool Converter::convertDuration(double& rfTime,
+                                std::string_view rString)
+{
+    std::string_view aTrimmed = trim(rString);
+    const char* pStr = aTrimmed.data();
+
+    // negative time duration?
+    bool bIsNegativeDuration = false;
+    if ( '-' == (*pStr) )
+    {
+        bIsNegativeDuration = true;
+        pStr++;
+    }
+
+    if ( *pStr != 'P' && *pStr != 'p' )            // duration must start with "P"
+        return false;
+    pStr++;
+
+    OUStringBuffer sDoubleStr;
+    bool bSuccess = true;
+    bool bDone = false;
+    bool bTimePart = false;
+    bool bIsFraction = false;
+    sal_Int32 nDays  = 0;
+    sal_Int32 nHours = 0;
+    sal_Int32 nMins  = 0;
+    sal_Int32 nSecs  = 0;
+    sal_Int32 nTemp = 0;
+
+    while ( bSuccess && !bDone )
+    {
+        sal_Unicode c = *(pStr++);
+        if ( !c )                               // end
+            bDone = true;
+        else if ( '0' <= c && '9' >= c )
+        {
+            if ( nTemp >= SAL_MAX_INT32 / 10 )
+                bSuccess = false;
+            else
+            {
+                if ( !bIsFraction )
+                {
+                    nTemp *= 10;
+                    nTemp += (c - u'0');
+                }
+                else
+                {
+                    sDoubleStr.append(c);
+                }
+            }
+        }
+        else if ( bTimePart )
+        {
+            if ( c == 'H' || c == 'h' )
+            {
+                nHours = nTemp;
+                nTemp = 0;
+            }
+            else if ( c == 'M' || c == 'm')
+            {
+                nMins = nTemp;
+                nTemp = 0;
+            }
+            else if ( (c == ',') || (c == '.') )
+            {
+                nSecs = nTemp;
+                nTemp = 0;
+                bIsFraction = true;
+                sDoubleStr = "0.";
+            }
+            else if ( c == 'S' || c == 's' )
+            {
+                if ( !bIsFraction )
+                {
+                    nSecs = nTemp;
+                    nTemp = 0;
+                    sDoubleStr = "0.0";
+                }
+            }
+            else
+                bSuccess = false;               // invalid character
+        }
+        else
+        {
+            if ( c == 'T' || c == 't' )            // "T" starts time part
+                bTimePart = true;
+            else if ( c == 'D' || c == 'd')
+            {
+                nDays = nTemp;
+                nTemp = 0;
+            }
+            else if ( c == 'Y' || c == 'y' || c == 'M' || c == 'm' )
+            {
+                //! how many days is a year or month?
+
+                OSL_FAIL( "years or months in duration: not implemented");
+                bSuccess = false;
+            }
+            else
+                bSuccess = false;               // invalid character
+        }
+    }
+
+    if ( bSuccess )
+    {
+        if ( nDays )
+            nHours += nDays * 24;               // add the days to the hours part
+        double fHour = nHours;
+        double fMin = nMins;
+        double fSec = nSecs;
+        double fFraction = sDoubleStr.makeStringAndClear().toDouble();
+        double fTempTime = fHour / 24;
+        fTempTime += fMin / (24 * 60);
+        fTempTime += fSec / (24 * 60 * 60);
+        fTempTime += fFraction / (24 * 60 * 60);
+
+        // negative duration?
+        if ( bIsNegativeDuration )
+        {
+            fTempTime = -fTempTime;
+        }
+
+        rfTime = fTempTime;
+    }
+    return bSuccess;
+}
+
 /** convert util::Duration to ISO8601 "duration" string */
 void Converter::convertDuration(OUStringBuffer& rBuffer,
         const ::util::Duration& rDuration)
@@ -1132,15 +1273,16 @@ enum Result { R_NOTHING, R_OVERFLOW, R_SUCCESS };
 
 }
 
+template <typename V>
 static Result
-readUnsignedNumber(std::u16string_view rString,
+readUnsignedNumber(V rString,
     size_t & io_rnPos, sal_Int32 & o_rNumber)
 {
     size_t nPos(io_rnPos);
 
     while (nPos < rString.size())
     {
-        const sal_Unicode c = rString[nPos];
+        const typename V::value_type c = rString[nPos];
         if (('0' > c) || (c > '9'))
             break;
         ++nPos;
@@ -1152,7 +1294,7 @@ readUnsignedNumber(std::u16string_view rString,
         return R_NOTHING;
     }
 
-    const sal_Int64 nTemp = rtl_ustr_toInt64_WithLength(rString.data() + io_rnPos, 10, nPos - io_rnPos);
+    const sal_Int64 nTemp = toInt64_WithLength(rString.data() + io_rnPos, 10, nPos - io_rnPos);
 
     const bool bOverflow = (nTemp >= SAL_MAX_INT32);
 
@@ -1161,9 +1303,10 @@ readUnsignedNumber(std::u16string_view rString,
     return bOverflow ? R_OVERFLOW : R_SUCCESS;
 }
 
+template<typename V>
 static Result
 readUnsignedNumberMaxDigits(int maxDigits,
-                            std::u16string_view rString, size_t & io_rnPos,
+                            V rString, size_t & io_rnPos,
                             sal_Int32 & o_rNumber)
 {
     bool bOverflow(false);
@@ -1570,6 +1713,15 @@ bool Converter::parseDateTime(   util::DateTime& rDateTime,
             rString);
 }
 
+/** convert ISO "date" or "dateTime" string to util::DateTime */
+bool Converter::parseDateTime(   util::DateTime& rDateTime,
+                                 std::string_view rString )
+{
+    bool isDateTime;
+    return parseDateOrDateTime(nullptr, rDateTime, isDateTime, nullptr,
+            rString);
+}
+
 static bool lcl_isLeapYear(const sal_uInt32 nYear)
 {
     return ((nYear % 4) == 0)
@@ -1673,14 +1825,15 @@ static void lcl_ConvertToUTC(
     }
 }
 
+template <typename V>
 static bool
-readDateTimeComponent(std::u16string_view rString,
+readDateTimeComponent(V rString,
     size_t & io_rnPos, sal_Int32 & o_rnTarget,
     const sal_Int32 nMinLength, const bool bExactLength)
 {
     const size_t nOldPos(io_rnPos);
     sal_Int32 nTemp(0);
-    if (R_SUCCESS != readUnsignedNumber(rString, io_rnPos, nTemp))
+    if (R_SUCCESS != readUnsignedNumber<V>(rString, io_rnPos, nTemp))
     {
         return false;
     }
@@ -1695,12 +1848,13 @@ readDateTimeComponent(std::u16string_view rString,
 }
 
 /** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+template<typename V>
 static bool lcl_parseDate(
                 bool & isNegative,
                 sal_Int32 & nYear, sal_Int32 & nMonth, sal_Int32 & nDay,
                 bool & bHaveTime,
                 size_t & nPos,
-                std::u16string_view string,
+                V string,
                 bool const bIgnoreInvalidOrMissingDate)
 {
     bool bSuccess = true;
@@ -1718,7 +1872,7 @@ static bool lcl_parseDate(
         // While W3C XMLSchema specifies years with a minimum of 4 digits, be
         // lenient in what we accept for years < 1000. One digit is acceptable
         // if the remainders match.
-        bSuccess = readDateTimeComponent(string, nPos, nYear, 1, false);
+        bSuccess = readDateTimeComponent<V>(string, nPos, nYear, 1, false);
         if (!bIgnoreInvalidOrMissingDate)
         {
             bSuccess &= (0 < nYear);
@@ -1733,7 +1887,7 @@ static bool lcl_parseDate(
     {
         ++nPos;
 
-        bSuccess = readDateTimeComponent(string, nPos, nMonth, 2, true);
+        bSuccess = readDateTimeComponent<V>(string, nPos, nMonth, 2, true);
         if (!bIgnoreInvalidOrMissingDate)
         {
             bSuccess &= (0 < nMonth);
@@ -1774,11 +1928,12 @@ static bool lcl_parseDate(
 }
 
 /** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+template <typename V>
 static bool lcl_parseDateTime(
                 util::Date *const pDate, util::DateTime & rDateTime,
                 bool & rbDateTime,
                 std::optional<sal_Int16> *const pTimeZoneOffset,
-                std::u16string_view string,
+                V string,
                 bool const bIgnoreInvalidOrMissingDate)
 {
     bool bSuccess = true;
@@ -1793,11 +1948,11 @@ static bool lcl_parseDateTime(
     bool bHaveTime(false);
 
     if (    !bIgnoreInvalidOrMissingDate
-        ||  string.find(':') == std::u16string_view::npos  // no time?
-        ||  (string.find('-') != std::u16string_view::npos
+        ||  string.find(':') == V::npos  // no time?
+        ||  (string.find('-') != V::npos
              && string.find('-') < string.find(':')))
     {
-        bSuccess &= lcl_parseDate(isNegative, nYear, nMonth, nDay,
+        bSuccess &= lcl_parseDate<V>(isNegative, nYear, nMonth, nDay,
                 bHaveTime, nPos, string, bIgnoreInvalidOrMissingDate);
     }
     else
@@ -1845,7 +2000,7 @@ static bool lcl_parseDateTime(
             ++nPos;
             const sal_Int32 nStart(nPos);
             sal_Int32 nTemp(0);
-            if (R_NOTHING == readUnsignedNumberMaxDigits(9, string, nPos, nTemp))
+            if (R_NOTHING == readUnsignedNumberMaxDigits<V>(9, string, nPos, nTemp))
             {
                 bSuccess = false;
             }
@@ -1902,7 +2057,7 @@ static bool lcl_parseDateTime(
     sal_Int32 nTimezoneMinutes(0);
     if (bSuccess && (bHaveTimezonePlus || bHaveTimezoneMinus))
     {
-        bSuccess = readDateTimeComponent(
+        bSuccess = readDateTimeComponent<V>(
                         string, nPos, nTimezoneHours, 2, true);
         bSuccess &= (0 <= nTimezoneHours) && (nTimezoneHours <= 14);
         bSuccess &= (nPos < string.size()); // not last token
@@ -1914,7 +2069,7 @@ static bool lcl_parseDateTime(
         {
             ++nPos;
 
-            bSuccess = readDateTimeComponent(
+            bSuccess = readDateTimeComponent<V>(
                         string, nPos, nTimezoneMinutes, 2, true);
             bSuccess &= (0 <= nTimezoneMinutes) && (nTimezoneMinutes < 60);
         }
@@ -2009,6 +2164,16 @@ bool Converter::parseTimeOrDateTime(
                 nullptr, rDateTime, dummy, nullptr, rString, true);
 }
 
+/** convert ISO "time" or "dateTime" string to util::DateTime */
+bool Converter::parseTimeOrDateTime(
+                util::DateTime & rDateTime,
+                std::string_view rString)
+{
+    bool dummy;
+    return lcl_parseDateTime(
+                nullptr, rDateTime, dummy, nullptr, rString, true);
+}
+
 /** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
 bool Converter::parseDateOrDateTime(
                 util::Date *const pDate, util::DateTime & rDateTime,
@@ -2020,6 +2185,16 @@ bool Converter::parseDateOrDateTime(
                 pDate, rDateTime, rbDateTime, pTimeZoneOffset, rString, false);
 }
 
+/** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+bool Converter::parseDateOrDateTime(
+                util::Date *const pDate, util::DateTime & rDateTime,
+                bool & rbDateTime,
+                std::optional<sal_Int16> *const pTimeZoneOffset,
+                std::string_view rString )
+{
+    return lcl_parseDateTime(
+                pDate, rDateTime, rbDateTime, pTimeZoneOffset, rString, false);
+}
 
 /** gets the position of the first comma after npos in the string
     rStr. Commas inside '"' pairs are not matched */
@@ -2501,11 +2676,11 @@ static sal_Int16 lcl_GetUnitFromString(V rString, sal_Int16 nDefaultUnit)
 
 sal_Int16 Converter::GetUnitFromString(std::u16string_view rString, sal_Int16 nDefaultUnit)
 {
-    return lcl_GetUnitFromString<std::u16string_view>(rString, nDefaultUnit);
+    return lcl_GetUnitFromString(rString, nDefaultUnit);
 }
 sal_Int16 Converter::GetUnitFromString(std::string_view rString, sal_Int16 nDefaultUnit)
 {
-    return lcl_GetUnitFromString<std::string_view>(rString, nDefaultUnit);
+    return lcl_GetUnitFromString(rString, nDefaultUnit);
 }
 
 bool Converter::convertAny(OUStringBuffer&    rsValue,
diff --git a/xmloff/inc/txtfldi.hxx b/xmloff/inc/txtfldi.hxx
index 736fa5bbd87d..6b3aa3365568 100644
--- a/xmloff/inc/txtfldi.hxx
+++ b/xmloff/inc/txtfldi.hxx
@@ -97,7 +97,7 @@ protected:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) = 0;
+                                   std::string_view sAttrValue ) = 0;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -139,7 +139,7 @@ protected:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -167,7 +167,7 @@ private:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -191,7 +191,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -226,7 +226,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -245,7 +245,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 };
 
 /** import page continuation fields (<text:page-continuation-string>) */
@@ -267,7 +267,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -297,7 +297,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -334,7 +334,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -356,7 +356,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 };
 
 /** import database next fields (<text:database-next>) */
@@ -380,7 +380,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -401,7 +401,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -426,7 +426,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -457,7 +457,7 @@ public:
 protected:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -488,7 +488,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -530,7 +530,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
     virtual void PrepareField(
         const css::uno::Reference<css::beans::XPropertySet> & xPropertySet) override;
 };
@@ -552,7 +552,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -582,7 +582,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -611,7 +611,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -636,7 +636,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -658,7 +658,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -679,7 +679,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -705,7 +705,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -730,7 +730,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -751,7 +751,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -781,7 +781,7 @@ private:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -814,7 +814,7 @@ private:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -860,7 +860,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// create textfield, attach master, and insert into document
     virtual void SAL_CALL endFastElement(sal_Int32 nElement) override;
@@ -882,7 +882,7 @@ public:
 private:
     /// no attributes -> empty method
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// no attributes -> empty method
     virtual void PrepareField(
@@ -900,7 +900,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -922,7 +922,7 @@ public:
 private:
     /// no attributes -> empty method
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// no attributes -> empty method
     virtual void PrepareField(
@@ -947,7 +947,7 @@ private:
 
     /// empty method; all attributes are handled in StartElement
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// convert aValues into sequence and set property
     virtual void PrepareField(
@@ -981,7 +981,7 @@ public:
 private:
     /// process attributes
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// set properties
     virtual void PrepareField(
@@ -1009,7 +1009,7 @@ public:
 private:
     /// process attributes
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// set properties
     virtual void PrepareField(
@@ -1029,7 +1029,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -1059,7 +1059,7 @@ public:
 private:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -1077,7 +1077,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -1095,7 +1095,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -1113,7 +1113,7 @@ public:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
diff --git a/xmloff/inc/txtvfldi.hxx b/xmloff/inc/txtvfldi.hxx
index 8d0fb73bdd51..67bc233b77cb 100644
--- a/xmloff/inc/txtvfldi.hxx
+++ b/xmloff/inc/txtvfldi.hxx
@@ -63,7 +63,7 @@ public:
 
     /// process attribute values
     void ProcessAttribute( sal_Int32 nAttrToken,
-                           const OUString& sAttrValue );
+                           std::string_view sAttrValue );
 
     /// prepare XTextField for insertion into document
     void PrepareField(
@@ -154,7 +154,7 @@ public:
 protected:
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -343,7 +343,7 @@ private:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -414,7 +414,7 @@ private:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// prepare XTextField for insertion into document
     virtual void PrepareField(
@@ -444,7 +444,7 @@ private:
 
     /// process attribute values
     virtual void ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue ) override;
+                                   std::string_view sAttrValue ) override;
 
     /// create, prepare and insert database field master and database field
     virtual void SAL_CALL endFastElement(sal_Int32 nElement) override;
diff --git a/xmloff/source/core/xmluconv.cxx b/xmloff/source/core/xmluconv.cxx
index 1517c7b8df86..6cda57185a3b 100644
--- a/xmloff/source/core/xmluconv.cxx
+++ b/xmloff/source/core/xmluconv.cxx
@@ -359,6 +359,13 @@ bool SvXMLUnitConverter::convertDateTime(double& fDateTime,
     return convertDateTime(fDateTime, rString, m_pImpl->m_aNullDate);
 }
 
+/** convert ISO Date Time String to double */
+bool SvXMLUnitConverter::convertDateTime(double& fDateTime,
+                     std::string_view rString)
+{
+    return convertDateTime(fDateTime, rString, m_pImpl->m_aNullDate);
+}
+
 /** convert double to ISO Date Time String */
 void SvXMLUnitConverter::convertDateTime( OUStringBuffer& rBuffer,
         const double& fDateTime,
@@ -447,8 +454,9 @@ void SvXMLUnitConverter::convertDateTime( OUStringBuffer& rBuffer,
 }
 
 /** convert ISO Date Time String to double */
-bool SvXMLUnitConverter::convertDateTime( double& fDateTime,
-                            std::u16string_view rString, const css::util::Date& aTempNullDate)
+template<typename V>
+static bool lcl_convertDateTime( double& fDateTime,
+                            V rString, const css::util::Date& aTempNullDate)
 {
     css::util::DateTime aDateTime;
     bool bSuccess = ::sax::Converter::parseDateTime(aDateTime, rString);
@@ -472,6 +480,18 @@ bool SvXMLUnitConverter::convertDateTime( double& fDateTime,
     return bSuccess;
 }
 
+bool SvXMLUnitConverter::convertDateTime( double& fDateTime,
+                            std::u16string_view rString, const css::util::Date& aTempNullDate)
+{
+    return lcl_convertDateTime(fDateTime, rString, aTempNullDate);
+}
+/** convert ISO Date Time String to double */
+bool SvXMLUnitConverter::convertDateTime( double& fDateTime,
+                            std::string_view rString, const css::util::Date& aTempNullDate)
+{
+    return lcl_convertDateTime(fDateTime, rString, aTempNullDate);
+}
+
 
 SvXMLTokenEnumerator::SvXMLTokenEnumerator( std::u16string_view rString, sal_Unicode cSeparator /* = ' ' */ )
 : maTokenString( rString ), mnNextTokenPos(0), mcSeparator( cSeparator )
diff --git a/xmloff/source/text/txtfldi.cxx b/xmloff/source/text/txtfldi.cxx
index da6a7b7710c0..dd73a5d9395b 100644
--- a/xmloff/source/text/txtfldi.cxx
+++ b/xmloff/source/text/txtfldi.cxx
@@ -134,7 +134,7 @@ void XMLTextFieldImportContext::startFastElement(
 {
     // process attributes
     for( auto &aIter : sax_fastparser::castToFastAttributeList( xAttrList ) )
-        ProcessAttribute(aIter.getToken(), aIter.toString() );
+        ProcessAttribute(aIter.getToken(), aIter.toView() );
 }
 
 OUString const & XMLTextFieldImportContext::GetContent()
@@ -552,7 +552,7 @@ void XMLSenderFieldImportContext::startFastElement(
 
 void XMLSenderFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue)
+    std::string_view sAttrValue)
 {
     if (XML_ELEMENT(TEXT, XML_FIXED) == nAttrToken) {
 
@@ -621,7 +621,7 @@ void XMLAuthorFieldImportContext::startFastElement(
     XMLTextFieldImportContext::startFastElement(nElement, xAttrList);
 }
 
-void XMLAuthorFieldImportContext::ProcessAttribute(sal_Int32 nAttrToken, const OUString& sAttrValue)
+void XMLAuthorFieldImportContext::ProcessAttribute(sal_Int32 nAttrToken, std::string_view sAttrValue)
 {
     if(nAttrToken == XML_ELEMENT(TEXT, XML_FIXED))
     {
@@ -685,7 +685,7 @@ XMLPageContinuationImportContext::XMLPageContinuationImportContext(
 }
 
 void XMLPageContinuationImportContext::ProcessAttribute(
-    sal_Int32 nAttrToken, const OUString& sAttrValue )
+    sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     switch(nAttrToken)
     {
@@ -702,7 +702,7 @@ void XMLPageContinuationImportContext::ProcessAttribute(
         }
         case XML_ELEMENT(TEXT, XML_STRING_VALUE):
         case XML_ELEMENT(OFFICE, XML_STRING_VALUE):
-            sString = sAttrValue;
+            sString = OUString::fromUtf8(sAttrValue);
             sStringOK = true;
             break;
         default:
@@ -744,16 +744,16 @@ XMLPageNumberImportContext::XMLPageNumberImportContext(
 
 void XMLPageNumberImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(STYLE, XML_NUM_FORMAT):
-            sNumberFormat = sAttrValue;
+            sNumberFormat = OUString::fromUtf8(sAttrValue);
             sNumberFormatOK = true;
             break;
         case XML_ELEMENT(STYLE, XML_NUM_LETTER_SYNC):
-            sNumberSync = sAttrValue;
+            sNumberSync = OUString::fromUtf8(sAttrValue);
             break;
         case XML_ELEMENT(TEXT, XML_SELECT_PAGE):
             SvXMLUnitConverter::convertEnum(eSelectPage, sAttrValue,
@@ -838,11 +838,11 @@ XMLPlaceholderFieldImportContext::XMLPlaceholderFieldImportContext(
 
 /// process attribute values
 void XMLPlaceholderFieldImportContext::ProcessAttribute(
-    sal_Int32 nAttrToken, const OUString& sAttrValue )
+    sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     switch (nAttrToken) {
     case XML_ELEMENT(TEXT, XML_DESCRIPTION):
-        sDescription = sAttrValue;
+        sDescription = OUString::fromUtf8(sAttrValue);
         break;
 
     case XML_ELEMENT(TEXT, XML_PLACEHOLDER_TYPE):
@@ -930,7 +930,7 @@ XMLTimeFieldImportContext::XMLTimeFieldImportContext(
 }
 
 void XMLTimeFieldImportContext::ProcessAttribute(
-    sal_Int32 nAttrToken, const OUString& sAttrValue )
+    sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -955,7 +955,7 @@ void XMLTimeFieldImportContext::ProcessAttribute(
         case XML_ELEMENT(STYLE, XML_DATA_STYLE_NAME):
         {
             sal_Int32 nKey = GetImportHelper().GetDataStyleKey(
-                                               sAttrValue, &bIsDefaultLanguage);
+                                               OUString::fromUtf8(sAttrValue), &bIsDefaultLanguage);
             if (-1 != nKey)
             {
                 nFormatKey = nKey;
@@ -1050,7 +1050,7 @@ XMLDateFieldImportContext::XMLDateFieldImportContext(
 
 void XMLDateFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -1109,17 +1109,17 @@ XMLDatabaseFieldImportContext::XMLDatabaseFieldImportContext(
 }
 
 void XMLDatabaseFieldImportContext::ProcessAttribute(
-    sal_Int32 nAttrToken, const OUString& sAttrValue )
+    sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(TEXT, XML_DATABASE_NAME):
-            m_sDatabaseName = sAttrValue;
+            m_sDatabaseName = OUString::fromUtf8(sAttrValue);
             m_bDatabaseOK = true;
             m_bDatabaseNameOK = true;
             break;
         case XML_ELEMENT(TEXT, XML_TABLE_NAME):
-            m_sTableName = sAttrValue;
+            m_sTableName = OUString::fromUtf8(sAttrValue);
             m_bTableOK = true;
             break;
         case  XML_ELEMENT(TEXT, XML_TABLE_TYPE):
@@ -1178,7 +1178,7 @@ css::uno::Reference< css::xml::sax::XFastContextHandler > XMLDatabaseFieldImport
         }
 
         // we call ProcessAttribute in order to set bValid appropriately
-        ProcessAttribute( XML_TOKEN_INVALID, OUString() );
+        ProcessAttribute( XML_TOKEN_INVALID, "" );
     }
     else
         XMLOFF_WARN_UNKNOWN_ELEMENT("xmloff", nElement);
@@ -1225,7 +1225,7 @@ XMLDatabaseNameImportContext::XMLDatabaseNameImportContext(
 }
 
 void XMLDatabaseNameImportContext::ProcessAttribute(
-    sal_Int32 nAttrToken, const OUString& sAttrValue )
+    sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     // delegate to superclass and check for success
     XMLDatabaseFieldImportContext::ProcessAttribute(nAttrToken, sAttrValue);
@@ -1257,20 +1257,20 @@ XMLDatabaseNextImportContext::XMLDatabaseNextImportContext(
 }
 
 void XMLDatabaseNextImportContext::ProcessAttribute(
-    sal_Int32 nAttrToken, const OUString& sAttrValue )
+    sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     if (XML_ELEMENT(TEXT, XML_CONDITION) == nAttrToken)
     {
         OUString sTmp;
         sal_uInt16 nPrefix = GetImport().GetNamespaceMap().GetKeyByAttrValueQName(
-                                    sAttrValue, &sTmp );
+                                    OUString::fromUtf8(sAttrValue), &sTmp );
         if( XML_NAMESPACE_OOOW == nPrefix )
         {
             sCondition = sTmp;
             bConditionOK = true;
         }
         else
-            sCondition = sAttrValue;
+            sCondition = OUString::fromUtf8(sAttrValue);
     }
     else
     {
@@ -1307,7 +1307,7 @@ XMLDatabaseSelectImportContext::XMLDatabaseSelectImportContext(
 
 void XMLDatabaseSelectImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     if (XML_ELEMENT(TEXT, XML_ROW_NUMBER) == nAttrToken)
     {
@@ -1354,15 +1354,15 @@ XMLDatabaseNumberImportContext::XMLDatabaseNumberImportContext(
 
 void XMLDatabaseNumberImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(STYLE, XML_NUM_FORMAT):
-            sNumberFormat = sAttrValue;
+            sNumberFormat = OUString::fromUtf8(sAttrValue);
             break;
         case XML_ELEMENT(STYLE, XML_NUM_LETTER_SYNC):
-            sNumberSync = sAttrValue;
+            sNumberSync = OUString::fromUtf8(sAttrValue);
             break;
         case XML_ELEMENT(TEXT, XML_VALUE_TYPE):
         case XML_ELEMENT(OFFICE, XML_VALUE_TYPE):
@@ -1423,7 +1423,7 @@ XMLSimpleDocInfoImportContext::XMLSimpleDocInfoImportContext(
 
 void XMLSimpleDocInfoImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     if (XML_ELEMENT(TEXT, XML_FIXED) == nAttrToken)
     {
@@ -1629,14 +1629,14 @@ XMLDateTimeDocInfoImportContext::XMLDateTimeDocInfoImportContext(
 
 void XMLDateTimeDocInfoImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(STYLE, XML_DATA_STYLE_NAME):
         {
             sal_Int32 nKey = GetImportHelper().GetDataStyleKey(
-                                               sAttrValue, &bIsDefaultLanguage);
+                                               OUString::fromUtf8(sAttrValue), &bIsDefaultLanguage);
             if (-1 != nKey)
             {
                 nFormat = nKey;
@@ -1700,14 +1700,14 @@ XMLUserDocInfoImportContext::XMLUserDocInfoImportContext(
 
 void XMLUserDocInfoImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(STYLE, XML_DATA_STYLE_NAME):
         {
             sal_Int32 nKey = GetImportHelper().GetDataStyleKey(
-                                               sAttrValue, &bIsDefaultLanguage);
+                                               OUString::fromUtf8(sAttrValue), &bIsDefaultLanguage);
             if (-1 != nKey)
             {
                 nFormat = nKey;
@@ -1720,7 +1720,7 @@ void XMLUserDocInfoImportContext::ProcessAttribute(
             if (!bValid)
             {
                 SetServiceName(sAPI_docinfo_custom );
-                aName = sAttrValue;
+                aName = OUString::fromUtf8(sAttrValue);
                 bValid = true;
             }
             break;
@@ -1774,20 +1774,20 @@ XMLHiddenParagraphImportContext::XMLHiddenParagraphImportContext(
 
 void XMLHiddenParagraphImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     if ( XML_ELEMENT(TEXT, XML_CONDITION) == nAttrToken)
     {
         OUString sTmp;
         sal_uInt16 nPrefix = GetImport().GetNamespaceMap().GetKeyByAttrValueQName(
-                                    sAttrValue, &sTmp );
+                                    OUString::fromUtf8(sAttrValue), &sTmp );
         if( XML_NAMESPACE_OOOW == nPrefix )
         {
             sCondition = sTmp;
             bValid = true;
         }
         else
-            sCondition = sAttrValue;
+            sCondition = OUString::fromUtf8(sAttrValue);
     }
     else if ( XML_ELEMENT(TEXT, XML_IS_HIDDEN) == nAttrToken)
     {
@@ -1829,7 +1829,7 @@ XMLConditionalTextImportContext::XMLConditionalTextImportContext(
 
 void XMLConditionalTextImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -1837,22 +1837,22 @@ void XMLConditionalTextImportContext::ProcessAttribute(
             {
                 OUString sTmp;
                 sal_uInt16 nPrefix = GetImport().GetNamespaceMap().
-                        GetKeyByAttrValueQName(sAttrValue, &sTmp);
+                        GetKeyByAttrValueQName(OUString::fromUtf8(sAttrValue), &sTmp);
                 if( XML_NAMESPACE_OOOW == nPrefix )
                 {
                     sCondition = sTmp;
                     bConditionOK = true;
                 }
                 else
-                    sCondition = sAttrValue;
+                    sCondition = OUString::fromUtf8(sAttrValue);
             }
             break;
         case XML_ELEMENT(TEXT, XML_STRING_VALUE_IF_FALSE):
-            sFalseContent = sAttrValue;
+            sFalseContent = OUString::fromUtf8(sAttrValue);
             bFalseOK = true;
             break;
         case XML_ELEMENT(TEXT, XML_STRING_VALUE_IF_TRUE):
-            sTrueContent = sAttrValue;
+            sTrueContent = OUString::fromUtf8(sAttrValue);
             bTrueOK = true;
             break;
         case XML_ELEMENT(TEXT, XML_CURRENT_VALUE):
@@ -1899,7 +1899,7 @@ XMLHiddenTextImportContext::XMLHiddenTextImportContext(
 
 void XMLHiddenTextImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -1907,19 +1907,19 @@ void XMLHiddenTextImportContext::ProcessAttribute(
             {
                 OUString sTmp;
                 sal_uInt16 nPrefix = GetImport().GetNamespaceMap().
-                            GetKeyByAttrValueQName(sAttrValue, &sTmp);
+                            GetKeyByAttrValueQName(OUString::fromUtf8(sAttrValue), &sTmp);
                 if( XML_NAMESPACE_OOOW == nPrefix )
                 {
                     sCondition = sTmp;
                     bConditionOK = true;
                 }
                 else
-                    sCondition = sAttrValue;
+                    sCondition = OUString::fromUtf8(sAttrValue);
             }
             break;
         case XML_ELEMENT(TEXT, XML_STRING_VALUE):
         case XML_ELEMENT(OFFICE, XML_STRING_VALUE):
-            sString = sAttrValue;
+            sString = OUString::fromUtf8(sAttrValue);
             bStringOK = true;
             break;
         case XML_ELEMENT(TEXT, XML_IS_HIDDEN):
@@ -1974,7 +1974,7 @@ XMLFileNameImportContext::XMLFileNameImportContext(
 
 void XMLFileNameImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -2054,7 +2054,7 @@ XMLTemplateNameImportContext::XMLTemplateNameImportContext(
 
 void XMLTemplateNameImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -2109,7 +2109,7 @@ XMLChapterImportContext::XMLChapterImportContext(
 
 void XMLChapterImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -2170,16 +2170,16 @@ XMLCountFieldImportContext::XMLCountFieldImportContext(
 
 void XMLCountFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(STYLE, XML_NUM_FORMAT):
-            sNumberFormat = sAttrValue;
+            sNumberFormat = OUString::fromUtf8(sAttrValue);
             bNumberFormatOK = true;
             break;
         case XML_ELEMENT(STYLE, XML_NUM_LETTER_SYNC):
-            sLetterSync = sAttrValue;
+            sLetterSync = OUString::fromUtf8(sAttrValue);
             break;
         default:
             XMLOFF_WARN_UNKNOWN_ATTR("xmloff", nAttrToken, sAttrValue);
@@ -2263,16 +2263,16 @@ XMLPageVarGetFieldImportContext::XMLPageVarGetFieldImportContext(
 
 void XMLPageVarGetFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(STYLE, XML_NUM_FORMAT):
-            sNumberFormat = sAttrValue;
+            sNumberFormat = OUString::fromUtf8(sAttrValue);
             bNumberFormatOK = true;
             break;
         case XML_ELEMENT(STYLE, XML_NUM_LETTER_SYNC):
-            sLetterSync = sAttrValue;
+            sLetterSync = OUString::fromUtf8(sAttrValue);
             break;
         default:
             XMLOFF_WARN_UNKNOWN_ATTR("xmloff", nAttrToken, sAttrValue);
@@ -2313,7 +2313,7 @@ XMLPageVarSetFieldImportContext::XMLPageVarSetFieldImportContext(
 
 void XMLPageVarSetFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -2377,16 +2377,16 @@ css::uno::Reference< css::xml::sax::XFastContextHandler > XMLMacroFieldImportCon
 
 void XMLMacroFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(TEXT, XML_DESCRIPTION):
-            sDescription = sAttrValue;
+            sDescription = OUString::fromUtf8(sAttrValue);
             bDescriptionOK = true;
             break;
         case XML_ELEMENT(TEXT, XML_NAME):
-            sMacro = sAttrValue;
+            sMacro = OUString::fromUtf8(sAttrValue);
             bValid = true;
             break;
         default:
@@ -2525,7 +2525,7 @@ void XMLReferenceFieldImportContext::startFastElement(
 
 void XMLReferenceFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -2534,7 +2534,7 @@ void XMLReferenceFieldImportContext::ProcessAttribute(
                 nSource = ReferenceFieldSource::ENDNOTE;
             break;
         case XML_ELEMENT(TEXT, XML_REF_NAME):
-            sName = sAttrValue;
+            sName = OUString::fromUtf8(sAttrValue);
             bNameOK = true;
             break;
         case  XML_ELEMENT(TEXT, XML_REFERENCE_FORMAT):
@@ -2559,7 +2559,7 @@ void XMLReferenceFieldImportContext::ProcessAttribute(
         }
         case XML_ELEMENT(LO_EXT, XML_REFERENCE_LANGUAGE):
         case XML_ELEMENT(TEXT, XML_REFERENCE_LANGUAGE):
-            sLanguage = sAttrValue;
+            sLanguage = OUString::fromUtf8(sAttrValue);
             break;
         default:
             XMLOFF_WARN_UNKNOWN_ATTR("xmloff", nAttrToken, sAttrValue);
@@ -2742,11 +2742,11 @@ XMLDdeFieldImportContext::XMLDdeFieldImportContext(
 
 void XMLDdeFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     if ( XML_ELEMENT(TEXT, XML_CONNECTION_NAME) == nAttrToken)
     {
-        sName = sAttrValue;
+        sName = OUString::fromUtf8(sAttrValue);
         bValid = true;
     }
     else
@@ -2818,7 +2818,7 @@ XMLSheetNameImportContext::XMLSheetNameImportContext(
 
 void XMLSheetNameImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue)
+    std::string_view sAttrValue)
 {
     // no attributes -> nothing to be done
     XMLOFF_WARN_UNKNOWN_ATTR("xmloff", nAttrToken, sAttrValue);
@@ -2842,7 +2842,7 @@ XMLPageNameFieldImportContext::XMLPageNameFieldImportContext(
 
 /// process attribute values
 void XMLPageNameFieldImportContext::ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue )
+                                   std::string_view sAttrValue )
 {
     XMLOFF_WARN_UNKNOWN_ATTR("xmloff", nAttrToken, sAttrValue);
 }
@@ -2867,16 +2867,16 @@ XMLUrlFieldImportContext::XMLUrlFieldImportContext(
 
 void XMLUrlFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(XLINK, XML_HREF):
-            sURL = GetImport().GetAbsoluteReference( sAttrValue );
+            sURL = GetImport().GetAbsoluteReference( OUString::fromUtf8(sAttrValue) );
             bValid = true;
             break;
         case XML_ELEMENT(OFFICE, XML_TARGET_FRAME_NAME):
-            sFrame = sAttrValue;
+            sFrame = OUString::fromUtf8(sAttrValue);
             bFrameOK = true;
             break;
         default:
@@ -2986,7 +2986,7 @@ void XMLBibliographyFieldImportContext::startFastElement(
 
 void XMLBibliographyFieldImportContext::ProcessAttribute(
     sal_Int32 ,
-    const OUString& )
+    std::string_view )
 {
     // attributes are handled in StartElement
     assert(false && "This should not have happened.");
@@ -3137,12 +3137,12 @@ XMLAnnotationImportContext::XMLAnnotationImportContext(
 
 void XMLAnnotationImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     if (nAttrToken == XML_ELEMENT(OFFICE, XML_NAME))
-        aName = sAttrValue;
+        aName = OUString::fromUtf8(sAttrValue);
     else if (nAttrToken == XML_ELEMENT(LO_EXT, XML_RESOLVED))
-        aResolved = sAttrValue;
+        aResolved = OUString::fromUtf8(sAttrValue);
     else
         XMLOFF_WARN_UNKNOWN_ATTR("xmloff", nAttrToken, sAttrValue);
 }
@@ -3337,17 +3337,17 @@ XMLScriptImportContext::XMLScriptImportContext(
 
 void XMLScriptImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(XLINK, XML_HREF):
-            sContent = GetImport().GetAbsoluteReference( sAttrValue );
+            sContent = GetImport().GetAbsoluteReference( OUString::fromUtf8(sAttrValue) );
             bContentOK = true;
             break;
 
         case XML_ELEMENT(SCRIPT, XML_LANGUAGE):
-            sScriptType = sAttrValue;
+            sScriptType = OUString::fromUtf8(sAttrValue);
             break;
 
         default:
@@ -3390,7 +3390,7 @@ XMLMeasureFieldImportContext::XMLMeasureFieldImportContext(
 
 void XMLMeasureFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -3486,21 +3486,21 @@ css::uno::Reference< css::xml::sax::XFastContextHandler > XMLDropDownFieldImport
 
 void XMLDropDownFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     if( nAttrToken == XML_ELEMENT(TEXT, XML_NAME))
     {
-        sName = sAttrValue;
+        sName = OUString::fromUtf8(sAttrValue);
         bNameOK = true;
     }
     else if (nAttrToken ==  XML_ELEMENT(TEXT, XML_HELP))
     {
-        sHelp = sAttrValue;
+        sHelp = OUString::fromUtf8(sAttrValue);
         bHelpOK = true;
     }
     else if (nAttrToken ==  XML_ELEMENT(TEXT, XML_HINT))
     {
-        sHint = sAttrValue;
+        sHint = OUString::fromUtf8(sAttrValue);
         bHintOK = true;
     }
     else
@@ -3556,7 +3556,7 @@ XMLHeaderFieldImportContext::XMLHeaderFieldImportContext(
 }
 
 /// process attribute values
-void XMLHeaderFieldImportContext::ProcessAttribute( sal_Int32 nAttrToken, const OUString& sAttrValue )
+void XMLHeaderFieldImportContext::ProcessAttribute( sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     XMLOFF_WARN_UNKNOWN_ATTR("xmloff", nAttrToken, sAttrValue);
 }
@@ -3578,7 +3578,7 @@ XMLFooterFieldImportContext::XMLFooterFieldImportContext(
 }
 
 /// process attribute values
-void XMLFooterFieldImportContext::ProcessAttribute( sal_Int32 nAttrToken, const OUString& sAttrValue)
+void XMLFooterFieldImportContext::ProcessAttribute( sal_Int32 nAttrToken, std::string_view sAttrValue)
 {
     XMLOFF_WARN_UNKNOWN_ATTR("xmloff", nAttrToken, sAttrValue);
 }
@@ -3602,7 +3602,7 @@ XMLDateTimeFieldImportContext::XMLDateTimeFieldImportContext(
 
 /// process attribute values
 void XMLDateTimeFieldImportContext::ProcessAttribute( sal_Int32 nAttrToken,
-                                   const OUString& sAttrValue )
+                                   std::string_view sAttrValue )
 {
     XMLOFF_WARN_UNKNOWN_ATTR("xmloff", nAttrToken, sAttrValue);
 }
diff --git a/xmloff/source/text/txtvfldi.cxx b/xmloff/source/text/txtvfldi.cxx
index f9e9a8a2fdba..bc59faa149fb 100644
--- a/xmloff/source/text/txtvfldi.cxx
+++ b/xmloff/source/text/txtvfldi.cxx
@@ -108,38 +108,38 @@ XMLVarFieldImportContext::XMLVarFieldImportContext(
 
 void XMLVarFieldImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(TEXT, XML_NAME):
-            sName = sAttrValue;
+            sName = OUString::fromUtf8(sAttrValue);
             bValid = true;      // we assume: field with name is valid!
             break;
         case XML_ELEMENT(TEXT, XML_DESCRIPTION):
-            sDescription = sAttrValue;
+            sDescription = OUString::fromUtf8(sAttrValue);
             bDescriptionOK = true;
             break;
         case XML_ELEMENT(TEXT, XML_HELP):
-            sHelp = sAttrValue;
+            sHelp = OUString::fromUtf8(sAttrValue);
             bHelpOK = true;
             break;
         case XML_ELEMENT(TEXT, XML_HINT):
-            sHint = sAttrValue;
+            sHint = OUString::fromUtf8(sAttrValue);
             bHintOK = true;
             break;
         case XML_ELEMENT(TEXT, XML_FORMULA):
             {
                 OUString sTmp;
                 sal_uInt16 nPrefix = GetImport().GetNamespaceMap().
-                        GetKeyByAttrValueQName(sAttrValue, &sTmp);
+                        GetKeyByAttrValueQName(OUString::fromUtf8(sAttrValue), &sTmp);
                 if( XML_NAMESPACE_OOOW == nPrefix )
                 {
                     sFormula = sTmp;
                     bFormulaOK = true;
                 }
                 else
-                    sFormula = sAttrValue;
+                    sFormula = OUString::fromUtf8(sAttrValue);
             }
             break;
         case XML_ELEMENT(TEXT, XML_DISPLAY):
@@ -343,18 +343,18 @@ XMLSequenceFieldImportContext::XMLSequenceFieldImportContext(
 }
 
 void XMLSequenceFieldImportContext::ProcessAttribute(
-    sal_Int32 nAttrToken, const OUString& sAttrValue )
+    sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(STYLE, XML_NUM_FORMAT):
-            sNumFormat = sAttrValue;
+            sNumFormat = OUString::fromUtf8(sAttrValue);
             break;
         case XML_ELEMENT(STYLE, XML_NUM_LETTER_SYNC):
-            sNumFormatSync = sAttrValue;
+            sNumFormatSync = OUString::fromUtf8(sAttrValue);
             break;
         case XML_ELEMENT(TEXT, XML_REF_NAME):
-            sRefName = sAttrValue;
+            sRefName = OUString::fromUtf8(sAttrValue);
             bRefNameOK = true;
             break;
         default:
@@ -585,7 +585,7 @@ XMLTableFormulaImportContext::XMLTableFormulaImportContext(
 
 void XMLTableFormulaImportContext::ProcessAttribute(
     sal_Int32 nAttrToken,
-    const OUString& sAttrValue )
+    std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -731,7 +731,7 @@ XMLVariableDeclImportContext::XMLVariableDeclImportContext(
 
             default:
                 // delegate to value helper
-                aValueHelper.ProcessAttribute(aIter.getToken(), aIter.toString());
+                aValueHelper.ProcessAttribute(aIter.getToken(), aIter.toView());
                 break;
         }
     }
@@ -913,12 +913,12 @@ XMLDatabaseDisplayImportContext::XMLDatabaseDisplayImportContext(
 }
 
 void XMLDatabaseDisplayImportContext::ProcessAttribute(
-    sal_Int32 nAttrToken, const OUString& sAttrValue )
+    sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
         case XML_ELEMENT(TEXT, XML_COLUMN_NAME):
-            sColumnName = sAttrValue;
+            sColumnName = OUString::fromUtf8(sAttrValue);
             bColumnOK = true;
             break;
         case XML_ELEMENT(TEXT, XML_DISPLAY):
@@ -1079,7 +1079,7 @@ XMLValueImportHelper::XMLValueImportHelper(
 }
 
 void XMLValueImportHelper::ProcessAttribute(
-    sal_Int32 nAttrToken, const OUString& sAttrValue )
+    sal_Int32 nAttrToken, std::string_view sAttrValue )
 {
     switch (nAttrToken)
     {
@@ -1168,7 +1168,7 @@ void XMLValueImportHelper::ProcessAttribute(
 
         case XML_ELEMENT(TEXT, XML_STRING_VALUE):
         case XML_ELEMENT(OFFICE, XML_STRING_VALUE):
-            sValue = sAttrValue;
+            sValue = OUString::fromUtf8(sAttrValue);
             bStringValueOK = true;
             break;
 
@@ -1176,21 +1176,21 @@ void XMLValueImportHelper::ProcessAttribute(
             {
                 OUString sTmp;
                 sal_uInt16 nPrefix = rImport.GetNamespaceMap().
-                        GetKeyByAttrValueQName(sAttrValue, &sTmp);
+                        GetKeyByAttrValueQName(OUString::fromUtf8(sAttrValue), &sTmp);
                 if( XML_NAMESPACE_OOOW == nPrefix )
                 {
                     sFormula = sTmp;
                     bFormulaOK = true;
                 }
                 else
-                    sFormula = sAttrValue;
+                    sFormula = OUString::fromUtf8(sAttrValue);
             }
             break;
 
         case XML_ELEMENT(STYLE, XML_DATA_STYLE_NAME):
         {
             sal_Int32 nKey = rHelper.GetDataStyleKey(
-                                          sAttrValue, &bIsDefaultLanguage);
+                                          OUString::fromUtf8(sAttrValue), &bIsDefaultLanguage);
             if (-1 != nKey)
             {
                 nFormatKey = nKey;