n3 Public key crypto related RRs
uSIG Signature
over RRset made using private key
uKEY Public
key, needed for verifying a SIG over a RRset
uDS Delegation
Signer; ÔPointerÕ for building chains of trust
n
nOne RR for internal consistency
Fauthenticated non-existance of data
uNXT Indicates
which RRset is the next one in the zone