DCTL1021

missing from iana definitions

Template has a record that has a name beginning with _ (underscore). These types or records are meant to be used as service enhancement calls, that follow well defined structure. Seeing the warning DCTL1021 warning does not necessarily mean template is invalid, this warning attempts to catch typos in well known strings.

See also https://datatracker.ietf.org/doc/html/rfc8552 and https://www.iana.org/assignments/dns-parameters/dns-parameters.txt