rdata_domain_ref
ns = domain_dname(rdata_domain_ref(z->soa_rrset->rrs[0]));
domain_type *closest_match = rdata_domain_ref(rrset->rrs[0]);
domain_type *dest = rdata_domain_ref(rrset->rrs[0]);
dname_compare(domain_dname(rdata_domain_ref(answer->rrsets[j]->rrs[0])), to_name) == 0) {
member_domain = rdata_domain_ref(rrset->rrs[0]);
const uint8_t* rr_ns_wire = dname_name(domain_dname(rdata_domain_ref(rr)));
uint8_t rr_ns_len = domain_dname(rdata_domain_ref(rr))->name_size;