read xml object
        :param url: contents url
        :param markup: markup provider
        :param game: MLBAM Game object
        :return: pitchpx.game.players.Players object

def read_xml(cls, url, markup, game):
        """
        read xml object
        :param url: contents url
        :param markup: markup provider
        :param game: MLBAM Game object
        :return: pitchpx.game.players.Players object
        """
        return Players._read_objects(MlbamUtil.find_xml("".join([url, cls.FILENAME]), markup) ,game)