Functional Requirements for Bibliographical Records
This is a report by a study group of the IfLa, ยป http://www.ifla.org/VII/s13/frbr/frbr.htm and http://www.ifla.org/VII/s13/frbr/frbr.pdf
It is motivated by the problems of navigating the result sets in on-line catalogues, and tries to restore much of the structure that library catalogues had before the advent of the card catalogue, which is essentially a flat file.
The earlier catalogues grouped editions and translations with the original, etc. Current practice uses what are effectively work-arounds like Authority files or Uniform titles for the same purpose (in Europe these are, however, usually realised as links).
The report is in part also important because it introduced the library profession to modern ideas of data modelling.