I have my things formatted like this:

<index>
<game><name>One</name><plays>456</plays></game>
<game><name>Two</name><plays>7532</plays></game>
</index>

There is alot more than two... but you get the point.
At the end of the page I'd like to count up all the plays. I can't find out how any where. Please advise.

<xsl:value-of select="sum(/index/game/plays)"/>

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference