Transforming Namespaced XHTML with XSLT

namespaced_xhtml_transform.xsl

<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
                xmlns="http://www.w3.org/1999/xhtml" 
                xmlns:x="http://www.w3.org/1999/xhtml" 
                exclude-result-prefixes="x"
                version="1.0">
  <!-- By default, copy everything unless we have a rule otherwise -->
  <xsl:template match="@*|node()">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
  </xsl:template>

  <!-- Do something with `div` elements in the XHTML namespace -->
  <xsl:template match="x:div">
    <!-- Warning: An XHTML pony is quite powerful -->
    <pony>
      <xsl:apply-templates match="@*|node()"/>
    </pony>  
  </xsl:template>

</xsl:stylesheet>