                 in a 10.0.0.1
name             in a 10.0.0.1
name.example.com in a 10.0.0.1

; cname rdata cannot be empty
                 in cname name
name2            in cname name
name2            in cname name.example.com

 in ptr other
name2 in ptr other
name2 in ptr other.example.com

; domain cannot be empty, but can be non-FQDN
@ in soa domain
@ in soa domain.example.com mail.example.com. [...]
@ in soa domain             mail              [...]
@ in soa @                  mail              [...]
@ in soa @                  @                 [...]

$ORIGIN @
$ORIGIN domain
$ORIGIN domain.example.com.
