Rewritten http://www-106.ibm.com/developerworks/xml/library/x-saxapi/listing4.html
to make easy to comapre how to "natutal is to manage state with SAX and with XMLPULL API.
This class will parse a rss or rdf document and build a Map consisting of
- attributes of a channel
- and a one attribute "items" which is a list with items, where each item consists
of a Map with attributes.