code: def open(self, url):
          
          protocol, location = self.__split(url)
          content = self.__find(location)
          if protocol == 'suds' and content is None:
              raise Exception, 'location "%s" not in document store' % location
          return content
docs: Open a document at the specified URL.
  
          The document URL's needs not contain a protocol identifier, and if it
          does, that protocol identifier is ignored when looking up the store
          content.
  
          Missing documents referenced using the internal 'suds' protocol are
          reported by raising an exception. For other protocols, None is returned
          instead.
  
          @param url: A document URL.
          @type url: str
          @return: Document content or None if not found.
          @rtype: bytes