def to_text(self, origin=None, relativize=True, **kw):
    'Convert an rdata to text format.\n        @rtype: string\n        '
    raise NotImplementedError
Convert an rdata to text format.
@rtype: string
def to_text(self, origin=None, relativize=True, **kw):
    'Convert an rdata to text format.\n        @rtype: string\n        '
    raise NotImplementedError