The following might help:
http://docs.akbkhome.com/pearcvs/XML_XSLT_Backend_MSXSL_Com.html

My understanding was that most php folks used the sablotron processor. 

http://www.onlamp.com/pub/a/onlamp/2001/03/16/sablotron.html




 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list