<xsl:key name="x" match="VEH" use="concat(../../@cod,'+',@tap)"/>
<xsl:param name="this" select="'1CA8ADH7P5..A0'"/>
then
select="//V14[(_at_)cod=$this]/V16/VEH[generate-id()=generate-id(key('x',concat($this,'+',@tap))[1])]"
will select the VEH corresponding to each unique value of @tab that
occurs below the V14 element with teh specified @cod attribute.
--
http://www.dcarlisle.demon.co.uk/matthew
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