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
Según MARC:
$e - Relator term (R) Describes the relationship between a name and a work.
$4 - Relator code (R) A MARC code for the relationship between a name and a work.
Según 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
http://kcoyle.blogspot.com/2006/11/relators.html
http://www.frbr.org/2006/11/08/relators
AACR2R:
21.0D Adición optativa. Designaciones de función 21.0D1