spot[foo
you don't mean that as spot doesn't have foo children, I think you mean
this:
<xsl:for-each select="spot">
<xsl:variable name="spot" select="."/>
<xsl:for-each
select="document('x.xml')/*/foo[(_at_)location=$spot/@value]/bar[(_at_)type=$spot/@name]">
something....
David
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