[BCP22]    Best Current Practice 22,
              <https://www.rfc-editor.org/info/bcp22>.
              At the time of writing, this BCP comprises the following:

              Scott, G., "Guide for Internet Standards Writers", BCP 22,
              RFC 2360, DOI 10.17487/RFC2360, June 1998,
              <https://www.rfc-editor.org/info/rfc2360>.