I store my database settings in xml as follows:

<?xml version="1.0" encoding="utf-8" ?>
<Columns>
  <F1 Seq="0" />
  <F2 Seq="1" />
  <F3 Seq="3" />
  <F4 Seq="9" />
  <F5 Seq="2" />
  <F6 Seq="4" />
  <F7 Seq="8" />
  <F8 Seq="5" />
  <F9 Seq="7" />
  <F10 Seq="6" />
</Columns>

I'd like to have the user sort the column order, so the resulting xml will 
look like:

<?xml version="1.0" encoding="utf-8" ?>
<Columns>
  <F1 Seq="0" />
  <F2 Seq="1" />
  <F5 Seq="2" />
  <F3 Seq="3" />
  <F6 Seq="4" />
  <F8 Seq="5" />
  <F10 Seq="6" />
  <F9 Seq="7" />
  <F7 Seq="8" />
  <F4 Seq="9" />
</Columns>

I use the following xslt, however it didn't give the result I expect:

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="/Columns/*">
    <xsl:copy>
      <xsl:apply-templates>
        <xsl:sort select="@Seq" order="descending" data-type="number"/>
      </xsl:apply-templates>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>

I'm new to xslt, I'd appreciate if anyone could show me how to create the 
xslt to address this problem.

Thanks,
P_Prdn