Please use this identifier to cite or link to this item:
doi:10.22028/D291-24933
Title: | Finite domains and exclusions as first-class citizens |
Author(s): | Boley, Harold |
Language: | English |
Year of Publication: | 1994 |
OPUS Source: | Kaiserslautern ; Saarbrücken : DFKI, 1994 |
SWD key words: | Künstliche Intelligenz |
DDC notations: | 004 Computer science, internet |
Publikation type: | Report |
Abstract: | 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). |
Link to this record: | urn:nbn:de:bsz:291-scidok-37160 hdl:20.500.11880/24989 http://dx.doi.org/10.22028/D291-24933 |
Series name: | Research report / Deutsches Forschungszentrum für Künstliche Intelligenz [ISSN 0946-008x] |
Series volume: | 94-07 |
Date of registration: | 28-Jun-2011 |
Faculty: | SE - Sonstige Einrichtungen |
Department: | SE - DFKI Deutsches Forschungszentrum für Künstliche Intelligenz |
Collections: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
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