def METHOD_NAME (self, tgt, flags=c.READ, ttype=None) :
    '''
    open(tgt, flags=READ)
    tgt:      saga.Url
    flags:    saga.namespace.flags enum
    ttype:    saga.task.type enum
    ret:      saga.namespace.Entry / saga.Task
    '''
    if not flags : flags = 0
    tgt_url = ru.Url (tgt)
    return self._adaptor.METHOD_NAME (tgt_url, flags, ttype=ttype)