Name is in use. At least one RR with a specified NAME (in the zone and class specified by the Zone Section) must exist. Note that this prerequisite is NOT satisfied by empty nonterminals.
For this prerequisite, a requestor adds to the section a single RR whose NAME is equal to that of the name whose ownership of an RR is required. RDLENGTH is zero and RDATA is therefore empty. CLASS must be specified as ANY to differentiate this condition from that of an actual RR whose RDLENGTH is naturally zero (0) (e.g., NULL). TYPE must be specified as ANY to differentiate this case from that of an RRset existence test. TTL is specified as zero (0).