XML::SAX is a new way to work with XML Parsers in Perl. In this article we'll
discuss why you should be using SAX, why you should be using XML::SAX, and
we'll see some of the finer implementation details. The text below assumes
some familiarity with callback, or push based parsing, but if you are
unfamiliar with these techniques then a good place to start is Kip Hampton's
excellent series of articles on XML.com.