XPath is an extremely powerful language for addressing an XML document. Although it has depths that we could not address even in a "tad tougher" tutorial, we have covered all of the most common features.
Hint
For the complete details on XPath, we recommend Definitive XSLT and XPath by G. Ken Holman of Crane Softwrights Ltd., http://www.CraneSoftwrights.com. We also thank Ken for his expert contributions to this chapter.