>Whats the difference between a wrox site and any other site?
Wrox provide this site as a service to their readers. Of course you don't have to be a reader to use it, but if you use it as a substitute for getting information from books, you can expect the odd hint that you might benefit from a different approach to your learning needs.
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference
