'@param mbox: See L{Record_RP.mbox}.
@type mbox: L{bytes} or L{unicode}
@param txt: See L{Record_RP.txt}
@type txt: L{bytes} or L{unicode}'

def __init__(self, mbox='', txt='', ttl=None):

    self.mbox = Name(mbox)
    self.txt = Name(txt)
    self.ttl = str2time(ttl)
