domain_find_zone
query->axfr_zone = domain_find_zone(nsd->db, closest_encloser);
zone = domain_find_zone(db, domain);
return domain_find_zone(db, zone->apex->parent);
zone_type* domain_find_zone(namedb_type* db, domain_type* domain);
q->zone = domain_find_zone(nsd->db, closest_encloser);