<xsl:when test="contains(name(.), 'sub3') " >
usually best not to use name() use
<xsl:when test="self::sub3" >
the problem i need to add to x and y within the element sub3 all the
priviouse x(s) and y(s) in last position of the elements sub2 and sub1
sub0 but could be more then these 3 elements
something like
<x><xsl:value-of select=". + sum(preceding-sibling::*[self::sub1 or
self::sub2]/x[last()])"/></x>
David
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