This is an old revision of the document!
http://www.loc.gov/marc/relators/relators.html
The purpose of this list of relator terms and associated codes is to allow the relationship between a name and a work to be designated by codes in the MARC record.
http://www.loc.gov/marc/relators/relaterm.html
http://www.loc.gov/marc/relators/relacode.html
OCLC: ‡4 Relator code: A three-character code that indicates the relationship of the entry to the item.
‡e Relator term: A designation of function that describes the relationship between a name and a work (e.g. collector, comp., defendant, ed., ill., joint author or tr.).
Blogs:
http://outgoing.typepad.com/outgoing/2006/10/relator_codes_a.html