<xsl:variable name="contemporaries" select="//person[(_at_)age=$age]"/>
Sum their incomes:
sum($contemporaries/group/@income)
That should probably be sum($contemporaries/parent::group/@income)
<cutomers>
<group income=1000>
<person age=10/>
<person age=15/>
<person age=30/>
</group>
<group income=2000>
<person age=10/>
<person age=40/>
</group>
<group income=5000>
<person age=20/>
<person age=20/>
</group>
</customers>
--
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/
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