I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. The document defines how IANA assigned values in two DNS registries (DNS CLASSes and Resource Record TYPEs) are to be translated into YANG enumerations, so that they can be later used in defining YANG modules modelling DNS configuration. The document introduces no new technology or protocol and only defines a one-to-one translation of IANA assigned values to YANG enumerations. Nits: I think that RFC 8174 should also be referenced (along with RFC 2119).