POE Filter for parsing XML

 POE::Filter::XML provides POE with a completely encapsulated XML parsing
 strategy for POE::Wheels that will be dealing with XML streams.
 .
 POE::Filter::XML relies upon XML::SAX and XML::SAX::ParserFactory to acquire
 a parser for parsing XML.
 .
 The assumed parser is XML::SAX::Expat::Incremental (Need a real push parser)
 .
 By default, the Filter will spit out POE::Filter::XML::Nodes because that is
 what the default XML::SAX compliant Handler produces from the stream it is
 given. You are of course encouraged to override the default Handler for your
 own purposes if you feel POE::Filter::XML::Node to be inadequate.