<xsl:stylesheet 
  xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
  result-ns="">

<xsl:param-variable name="lang" expr="'de'"/>

<xsl:template match="*[lang($lang)]">
  <xsl:apply-templates/>
</xsl:template>

<xsl:template match="*[@xml:lang and not(lang($lang))]">
</xsl:template>


</xsl:stylesheet>


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list