[BCP216]   Best Current Practice 216,
              <https://www.rfc-editor.org/info/bcp216>.
              At the time of writing, this BCP comprises the following:

              Bierman, A., "Guidelines for Authors and Reviewers of
              Documents Containing YANG Data Models", BCP 216, RFC 8407,
              DOI 10.17487/RFC8407, October 2018,
              <https://www.rfc-editor.org/info/rfc8407>.