TypeFromString returns the type from the string s.

Typify classifies a message, it returns the Type.

Delegation is a msg with a pointer to another nameserver: NOERROR in header, NS in auth, optionally fluff in additional (not checked).

Expired if sigs expired: don't cache these.

Meta indicates a meta message, NOTIFY, or a transfer: qType is IXFR or AXFR.

NameError is a NXDOMAIN in header, SOA in auth.

NoCache indicates a no cache reply.

NoData indicates name found, but not the type: NOERROR in header, SOA in auth.

NoError indicates a positive reply.

OtherError indicates any other error.

Update is an dynamic update message.

Type is the type of the message.