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URN: urn:nbn:de:bsz:291-scidok-37160
URL: http://scidok.sulb.uni-saarland.de/volltexte/2011/3716/


Finite domains and exclusions as first-class citizens

Boley, Harold

Quelle: (1994) Kaiserslautern ; Saarbrücken : DFKI, 1994
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Dokument 1.pdf (218 KB)

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SWD-Schlagwörter: Künstliche Intelligenz
Institut: DFKI Deutsches Forschungszentrum für Künstliche Intelligenz
DDC-Sachgruppe: Informatik
Dokumentart: Report (Bericht)
Schriftenreihe: Research report / Deutsches Forschungszentrum für Künstliche Intelligenz [ISSN 0946-008x]
Bandnummer: 94-07
Sprache: Englisch
Erstellungsjahr: 1994
Publikationsdatum: 28.06.2011
Kurzfassung auf Englisch: Languages based on logical variables can regard finite domains, finite exclusions, and, generally, types as values. Like a variable can be bound to a non-ground structure which can be later specialized through in-place assignment of some inner variables, it can also be bound to, say, a domain structure which can be specialized later through "in-place deletion" of some of its elements (e.g. by intersection with other domain structures). While finite domains prescribe the elements of a disjunctive structure, the complementary finite exclusions forbid the elements of a conjunctive structure. Domains and exclusions can be values of variables or occur inside clauses as/in terms or within an occurrence-binding construct (useful to name arbitrary terms).In a relational-functional language (e.g., RELFUN) they can also be returned as values of functions. Altogether, domains and exclusions become first-class citizens. Because they are completely handled by an extended unification routine, they do not require delay techniques needed in (more expressive) constraint systems. Still, their backtracking-superseding "closed" representation leads to smaller proof trees (efficiency), and abstracted, intensional answers (readability). Anti-unification (for generalization) exchanges the roles of domains and exclusions. The operational semantics of domains, exclusions, and occurrence bindings is specified by a RELFUN meta-unify function (and implemented in pure LISP).
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