For example, www.example.com.
As defined in RFC 1035 (section 5) and RFC 1034 (section 3.6.1)
Number of seconds that this ResourceRecordSet can be cached by resolvers.
One of valid DNS resource types. Possible values are: A, AAAA, CAA, CNAME, DNSKEY, DS, HTTPS, IPSECVPNKEY, MX, NAPTR, NS, PTR, SOA, SPF, SRV, SSHFP, SVCB, TLSA, TXT.
A
AAAA
CAA
CNAME
DNSKEY
DS
HTTPS
IPSECVPNKEY
MX
NAPTR
NS
PTR
SOA
SPF
SRV
SSHFP
SVCB
TLSA
TXT