#!/usr/bin/python

import sys, urllib, xml.sax

class RSSTypeChecker(xml.sax.handler.ContentHandler): 
   def startElement(self, tag, attrs): 
      types = {'RDF': '1.0', 'Channel': '1.1', 'rss': '2.0'}
      print "This is an RSS %s document" % types[tag.split(':').pop()]
      sys.exit()

def main(): 
   parser = xml.sax.make_parser()
   parser.setContentHandler(RSSTypeChecker())
   parser.parse(urllib.urlopen(sys.argv[1]))

if __name__=="__main__": 
   main()