[XML-SIG] My first xml sax import

[Thomas Gagne]

The tutorial for xmllib shows how to create a document handler class and
include sample code for the startElement() method, but it doesn't list what
other methds are available and their arguments (and why should it, it's a
tutorial?)  Problem is, the library reference for xmllib doesn't list a method
called startElement().  I assume there's probably one called endElement() but
what do I do about the value for the tag?