For future reference for anyone interested in creating an XSLT 1.0
version of the stylesheets, some recent discussion about the crucial
exsl:node-set function (the equivalent natively supported in XSLT 2.0):
http://dpcarlisle.blogspot.com/2007/05/exslt-node-set-function.html
http://www.jenitennison.com/blog/node/24
Bruce