dns_name_isabsolute
(dns_name_isabsolute(name) ||
!dns_name_isabsolute(name))
INSIST(dns_name_isabsolute(lookup->name));
REQUIRE(dns_name_isabsolute(name));
if (dns_name_isabsolute(prefix))
REQUIRE(dns_name_isabsolute(name));
dns_name_isabsolute(const dns_name_t *name);
REQUIRE(tctx->origin == NULL || dns_name_isabsolute(tctx->origin));