[BCP45]    Best Current Practice 45,
              <https://www.rfc-editor.org/info/bcp45>.
              At the time of writing, this BCP comprises the following:

              Eggert, L. and S. Harris, "IETF Discussion List Charter",
              BCP 45, RFC 9245, DOI 10.17487/RFC9245, June 2022,
              <https://www.rfc-editor.org/info/rfc9245>.