SAX2, by David Brownell, has been published by O'Reilly and Associates.

This is a compact book (240 pages) on using SAX2 for XML processing in Java applications.

There are but brief, historical notes on the earlier SAX API, and then discussion of the various handler interfaces for SAX. More complex matters such as namespace handling get their own sections. The appendices provide an API reference and a mapping to Infoset concepts.

A sample chapter is available on-line: Chapter 3: Producing SAX2 Events.

David Brownell, long-time XML expert and XML-DEV contributor, stepped up to lead the SAX projects after David Megginson sought a richly-deserved retirement from the post in 2001. David has overseen the project's move to SourceForge, overseen releases, and guided the discussion through which the API is refined.