You should not instantiate this class directly; rather, call
parseXRDS statically:
$xrds = Auth_Yadis_XRDS::parseXRDS($xml_string);If the XRDS can be parsed and is valid, an instance of Auth_Yadis_XRDS will be returned. Otherwise, null will be returned. This class is used by the Auth_Yadis_Yadis::discover method.