What does RDA not include?
While RDA does not include instructions on how to create or format subject headings (FRBR’s Group 3 entities), it does refer to them with regard to their relationship to Group 1 FRBR entities. Even so, there are “place-holder” chapters (found in sections 4 and 10) for the Group 3 entities, anticipating future work on RDA. RDA does not include instructions on the provision of classification or Cutter numbers, or on content designation used in formats such as MARC 21 and mark-up languages such as XML.