Simplify document handler programs with the SAX parser

Sometimes the code of a SAX document handler can become cumbersome, poorly structured, and difficult to maintain, especially for complex XML structures with many different elements. This article presents a design strategy that addresses this problem, and, therefore, can improve the quality and the maintainability of your code.

http://www-106.ibm.com/developerworks/xml/library/x-dochan.html