def get_url(self):
if not self.has_url():<EOL><INDENT>raise IllegalState()<EOL><DEDENT>else:<EOL><INDENT>return self._my_map['<STR_LIT:url>']<EOL><DEDENT>
Gets the URL associated with this content for web-based
        retrieval.

        return: (string) - the url for this data
        raise:  IllegalState - has_url() is false
        compliance: mandatory - This method must be implemented.