Description:

WARNING: Beta code alert.

A SAX2 filter that dispatches SAX events based on "EventPath" patterns
as the SAX events arrive. The SAX events are not buffered or
converted to an in-memory document representation like a DOM tree.
This provides for low lag operation because the actions associated
with each pattern are executed as soon as possible, usually in an
element's start_element() event method.

This differs from traditional XML pattern matching tools like XPath
and XSLT (which is XPath-based) which require the entire document to
be built in memory (as a "DOM tree") before queries can be executed.
In SAX terms, this means that they have to build a DOM tree from SAX
events and delay pattern matching until the end_document() event
method is called.