<xsl:template match="Concat">
<xsl:for-each select="(.//*[not(*)])">
<xsl:sort data-type="number" select="-count(ancestor::*)"/>
<xsl:if test="position()=1">
<xsl:value-of select="name()"/>
</xsl:if>
</xsl:for-each>
</xsl:template>
probably:-)
David
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