napoli@crin.crin.fr (Amedeo NAPOLI) (07/27/88)
Who can tell me the semantics of the slot "classification" in the frame based language FRL (Goldstein, Roberts 1977) ? This slot may be assigned with either "generic" or "individual". What do these values actually mean ? In particuliar, is it possible to instantiate again a frame that has "individual" in its classification slot. Moreover, is the language still available and, if so, how can I get it ? Thanks in advance, Amedeo Napoli -- --- Amedeo Napoli @ CRIN / Centre de Recherche en Informatique de Nancy EMAIL : napoli@crin.crin.fr - POST : BP 239, 54506 VANDOEUVRE CEDEX, France
finin@antares (Tim Finin) (07/29/88)
In article <576@crin.crin.fr>, napoli@crin (Amedeo NAPOLI) writes: >Who can tell me the semantics of the slot "classification" in the frame based >language FRL (Goldstein, Roberts 1977) ? >This slot may be assigned with either "generic" or "individual". >What do these values actually mean ? In particuliar, is it possible to >instantiate again a frame that has "individual" in its classification slot. >Moreover, is the language still available and, if so, how can I get it ? As I recall, FRL didn't assign any semantics to the classification slot. It was, however, commonly used by applications to differentiate frames which represented generic objects from those representing individual ones. What this meant, exactly, was usually very application dependent. In fact, the difficulty in deciding what such a distinction should mean in general in FRL and similar early frame representation languages was the focus of a lot of discussion and research in the early eighties. One result was the architecture used in many representation systems which includes an object oriented descriptive component and an expression oriented assertional component. Information about individuals is then relegated to the assertional component. -- Tim Finin finin@prc.unisys.com Paoli Research Center ..!{psuvax1,sdcrdcf,cbmvax}!burdvax!finin Unisys 215-648-7446 (office) 215-386-1749 (home) PO Box 517, Paoli PA 19301 215-648-7412 (fax)