Scaling Up with XQuery, Part 2
http://www.xml.com/lpt/a/1661

DuCharme, Bob
XML.com
2006

Abstract:

Gets you to the point where you could start exploring those features with a reasonably large collection of your own data. Without spending any money, you can check them all out and discover the advantages to having large amounts of your XML stored in a database where you (or an application!) can use a W3C standard language to quickly retrieve what you want from that database.