in xsl 1 a key always searches the document that contains the current
node. 
in xsl 2 it still only searches one document but you can switch
documents (or document fragments) that it searches by supplying a
document (or element) node as the third argument of key(....)


David

________________________________________________________________________
This e-mail has been scanned for all viruses by Star. The
service is powered by MessageLabs. For more information on a proactive
anti-virus service working around the clock, around the globe, visit:
http://www.star.net.uk
________________________________________________________________________