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[xsl] how to output elements in random order?

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Is there a standard (clean) way to process (output) elements in random
order, possibliy specifiyng a "seed" as a parameter to the stylesheet?

It's not just a speculation. One motivation, for example, is that I'm
tryng to use XSLT to produce randomly premuted multiple choice tests for
grading students. Given a set of questions each one with a various number
of possible answers, I wuold like to output questions in random order and
answers within a quastion in random order too.

Now I'm basically using something like

 	<xsl:for-each select="question">
 		<xsl:sort select="ext:rnd()"/>
 		...
 	</xsl:for-each>

where ext:rnd() is an extension function returing a random integer. It
works with Xalan, but I know it is an ugly ugly hack...

Is there any clean way to do such a thing (note that STFW seems to lead
no useful result)?

Thank you for any suggestion...

 		Massimo
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