Some other good sources for sample XML processing material:

http://www.cafeconleche.org/books/bible3/source/ -- Examples from The XML 1.1 Bible, by Elliotte Rusty Harold ( http://www.cafeconleche.org/books/bible3/ )

http://skew.org/xml/ - the skew.org XML & XSLT resources (many useful XSLT transforms)

http://www.cranesoftwrights.com/resources/ - Free resources from Crane Softwrights Ltd. (many great XML and XSLT examples)
