[BCP219]   Best Current Practice 219,
              <https://www.rfc-editor.org/info/bcp219>.
              At the time of writing, this BCP comprises the following:

              Hoffman, P. and K. Fujiwara, "DNS Terminology", BCP 219,
              RFC 9499, DOI 10.17487/RFC9499, March 2024,
              <https://www.rfc-editor.org/info/rfc9499>.