intersection revisited

Hi,
 
This is a message to Michael Kay. He once offered
an xpath expression to produce "intersection of nodesets" functionality
with this code extract:
 
<xsl:variable name="A" select="/dept/person[@dept_id = 1]" />
<xsl:variable name="B" select="/dept/person[smoker = 'yes']" />

<xsl:variable name="intersect" select="$A [count(.|$B) = count($B)]"/>
 
I tried this on MSXML3 final and Xalan and it did not
produce the expected intersection. Is there something wrong with the
xpath ? Michael? Anyone?

Thanks

Gavin


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