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d| _dS )aq Initialize an inbound zone transfer.
*txn_manager* is a :py:class:`dns.transaction.TransactionManager`.
*rdtype* can be `dns.rdatatype.AXFR` or `dns.rdatatype.IXFR`
*serial* is the base serial number for IXFRs, and is required in
that case.
*is_udp*, a ``bool`` indidicates if UDP is being used for this
XFR.
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Returns `True` if the transfer is complete, and `False` otherwise.
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� ||fS )a Make an AXFR or IXFR query.
*txn_manager* is a ``dns.transaction.TransactionManager``, typically a
``dns.zone.Zone``.
*serial* is an ``int`` or ``None``. If 0, then IXFR will be
attempted using the most recent serial number from the
*txn_manager*; it is the caller's responsibility to ensure there
are no write transactions active that could invalidate the
retrieved serial. If a serial cannot be determined, AXFR will be
forced. Other integer values are the starting serial to use.
``None`` forces an AXFR.
Please see the documentation for :py:func:`dns.message.make_query` and
:py:func:`dns.message.Message.use_tsig` for details on the other parameters
to this function.
Returns a `(query, serial)` tuple.
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tjj�}|d jS )a7 Extract the SOA serial number from query if it is an IXFR and return
it, otherwise return None.
*query* is a dns.message.QueryMessage that is an IXFR or AXFR request.
Raises if the query is not an IXFR or AXFR, or if an IXFR doesn't have
an appropriate SOA RRset in the authority section.
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