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If not ``None``, then the owner name is "forced", and the input must not specify an owner name. If ``None``, then any owner names are allowed and must be present in the input. *ttl*, an ``int``, string, or None. If not ``None``, the the TTL is forced to be the specified value and the input must not specify a TTL. If ``None``, then a TTL may be specified in the input. If it is not specified, then the *default_ttl* will be used. *rdclass*, a ``dns.rdataclass.RdataClass``, string, or ``None``. If not ``None``, then the class is forced to the specified value, and the input must not specify a class. If ``None``, then the input may specify a class that matches *default_rdclass*. Note that it is not possible to return rrsets with differing classes; specifying ``None`` for the class simply allows the user to optionally type a class as that may be convenient when cutting and pasting. *default_rdclass*, a ``dns.rdataclass.RdataClass`` or string. 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