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    @param rdclass: The class of the zone transfer.  The default is
    dns.rdataclass.IN.
    @type rdclass: int or string
    @param timeout: The number of seconds to wait for each response message.
    If None, the default, wait forever.
    @type timeout: float
    @param port: The port to which to send the message.  The default is 53.
    @type port: int
    @param keyring: The TSIG keyring to use
    @type keyring: dict
    @param keyname: The name of the TSIG key to use
    @type keyname: dns.name.Name object or string
    @param relativize: If True, all names in the zone will be relativized to
    the zone origin.  It is essential that the relativize setting matches
    the one specified to dns.zone.from_xfr().
    @type relativize: bool
    @param af: the address family to use.  The default is None, which
    causes the address family to use to be inferred from the form of where.
    If the inference attempt fails, AF_INET is used.
    @type af: int
    @param lifetime: The total number of seconds to spend doing the transfer.
    If None, the default, then there is no limit on the time the transfer may
    take.
    @type lifetime: float
    @rtype: generator of dns.message.Message objects.
    @param source: source address.  The default is the wildcard address.
    @type source: string
    @param source_port: The port from which to send the message.
    The default is 0.
    @type source_port: int
    @param serial: The SOA serial number to use as the base for an IXFR diff
    sequence (only meaningful if rdtype == dns.rdatatype.IXFR).
    @type serial: int
    @param use_udp: Use UDP (only meaningful for IXFR)
    @type use_udp: bool
    @param keyalgorithm: The TSIG algorithm to use; defaults to
    dns.tsig.default_algorithm
    @type keyalgorithm: string
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