XML Processing in Ajax, Part 1: Four Approaches
http://www.ibm.com/developerworks/web/library/x-xmlajaxpt1/index.html

Pruett, Mark
IBM
2008

Abstract:

Any programming problem can be solved in multiple right ways. This series looks at four approaches for creating an Asynchronous JavaScript + XML (Ajax) weather badge, a small reusable widget that's easily embedded on any Web page. This first article lays the foundation and examines the first approach--walking the DOM tree.