Here is a simple class that allows you to use POST and GET to return XML data from a URL (budget webservice). It works really well, you can just extend it by adding your own required methods, or you could set it up with one generic method that supplies the event type, etc. and you could send it an object with properties instead of specific arguments (so you could loop through and inspect them).  

http://www.ericd.net/2007/11/as2-class-xmlconduit.html 

http://blog.maxgarfinkel.com/archives/8

This class provides an easy way to load and/or send an XML file and parse the data into a format that’s simple to work with. Every node becomes an array with the same name. All attributes are also easily accessible because they become properties with the same name.

http://blog.greensock.com/?cat=3

http://www.shockwave-india.com/blog/actionscript2/?asfile=XMLHighlighter.as

 http://www.meychi.com/source/actionscript/classes/MXCService.as

http://www.meychi.com/source/actionscript/classes/FeedParser.as 

http://www.createage.com/blog/?p=104 

http://weblogs.macromedia.com/mesh/archives/2004/02/atom_feed_actio.html