Re: Random node

You could have a node-set consisting of all the nodes you want to choose from,
and then multiply 1 less than the size of that set, as obtained by count() or
last(), by the random number that's between 0 and 1, rounding down, and then
adding 1. This will give you a number between 1 and the size of the set, which
you can use as a positional predicate, like this:

<xsl:variable name="someNodes" select="/path/to/some/nodes/*"/>
<xsl:variable name="randomNode" select="$someNodes[floor(math:random() * (last() -1)) + 1]"/>

Untested code but should give you some ideas...