I posted some POD to the perl-xml list for a module I'm considering writing. If you're interested in XML Schema validation with Perl please check it out:
http://aspn.activestate.com/ASPN/Mail/Message/perl-xml/1795954
No, I don't know what "&_XSLT" is or what kind of crack the ActiveState highlighter is smoking. I certainly didn't put those spaces between "->" and method names in there!
-sam