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� ||fS )a Make an AXFR or IXFR query.
*txn_manager* is a ``dns.transaction.TransactionManager``, typically a
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*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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it, otherwise return None.
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an appropriate SOA RRset in the authority section.
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