Transform dataset to excel with schema information

Hi, I use xml xsl transformation to export datasets as excel file. Here is the code, The only thing I need is my Excel.xsl do not look schema information. So it transform all the data as ss:Type="String". I need an xsl that take cares of orjinal data types and convert according to that. So do you have or know an excel.xsl that convert with schema, my current xsl is below.

// Dataset ds is ready
StringWriter sw = new StringWriter();

StringWriter stw = new StringWriter();                

ds.WriteXml(stw, XmlWriteMode.WriteSchema);
XmlDataDocument xdd = new XmlDataDocument();
xdd.LoadXml(stw.ToString());

XslCompiledTransform xslCompiledTransform = new XslCompiledTransform();
xslCompiledTransform.Load(HttpContext.Current.Server.MapPath("/include/TransformXSLs/Excel.xsl"));
xslCompiledTransform.Transform(xdd, null, sw);


// Excel.xsl

<xsl:stylesheet version="1.0"
    xmlns="urn:schemas-microsoft-com:office:spreadsheet"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:msxsl="urn:schemas-microsoft-com:xslt"
 xmlns:user="urn:my-scripts"
 xmlns:o="urn:schemas-microsoft-com:office:office"
 xmlns:x="urn:schemas-microsoft-com:office:excel"
 xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" > 
 
<xsl:template match="/">
  <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
    xmlns:o="urn:schemas-microsoft-com:office:office"
    xmlns:x="urn:schemas-microsoft-com:office:excel"
    xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
    xmlns:html="http://www.w3.org/TR/REC-html40">
    <xsl:apply-templates/>
  </Workbook>
</xsl:template>


<xsl:template match="/*">
  <Worksheet>
  <xsl:attribute name="ss:Name">
  <xsl:value-of select="local-name(/*/*)"/>
  </xsl:attribute>
    <Table x:FullColumns="1" x:FullRows="1">
      <Row>
        <xsl:for-each select="*[position() = 1]/*">
          <Cell><Data ss:Type="String">
          <xsl:value-of select="local-name()"/>
          </Data></Cell>
        </xsl:for-each>
      </Row>
      <xsl:apply-templates/>
    </Table>
  </Worksheet>
</xsl:template>


<xsl:template match="/*/*">
  <Row>
    <xsl:apply-templates/>
  </Row>
</xsl:template>


 
<xsl:template match="/*/*/*">
  <xsl:choose>
    <xsl:when test=".='-999999'">
      <Cell>
        <Data ss:Type="String">
         
        </Data>
      </Cell>
    </xsl:when>
    <xsl:otherwise>
      <Cell>
        <Data ss:Type="String">
          <xsl:value-of select="."/>
        </Data>
      </Cell>
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>


</xsl:stylesheet>