Thanks for that answer but unfortunately, I can't get it to work. I
don't know if it is due to the fact that I'm using Internet Explorer to
see the transform but I'm getting this error:

'Reference to variable or parameter 'k1' must evaluate to a node list.'

<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs">
<xsl:variable name="k1" as="xs:string+">
<xsl:perform-sort select="x/titles/key">
<xsl:sort select="."/>
</xsl:perform-sort>
</xsl:variable>

	Martin Honnen
	http://JavaScript.FAQTs.com/