<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns="http://www.w3.org/1999/xhtml"
                xmlns:x="http://www.w3.org/1999/xhtml"
                version="1.0">
  <xsl:template match="x:dt[. = preceding-sibling::x:dt[1]]"/>
  <!-- by default copy everything varbatim -->
  <xsl:template match="@*|node()">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>