A unification method for disjunctive feature descriptions
ACL '87 Proceedings of the 25th annual meeting on Association for Computational Linguistics
Unification of disjunctive feature descriptions
ACL '88 Proceedings of the 26th annual meeting on Association for Computational Linguistics
On building a more efficient grammar by exploiting types
Natural Language Engineering
Constraint projection: an efficient treatment of disjunctive feature descriptions
ACL '91 Proceedings of the 29th annual meeting on Association for Computational Linguistics
COLING '92 Proceedings of the 14th conference on Computational linguistics - Volume 1
JAUNT: a constraint solver for disjunctive feature structures
COLING '92 Proceedings of the 14th conference on Computational linguistics - Volume 4
Unifying disjunctive feature structures
COLING '92 Proceedings of the 14th conference on Computational linguistics - Volume 4
EACL '12 Proceedings of the 13th Conference of the European Chapter of the Association for Computational Linguistics
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This paper describes two novel techniques which, when applied together, in practice significantly reduce the time required for unifying disjunctive feature structures. The first is a safe but fast method for discarding irrelevant disjunctions from newly-created structures. The second reduces the time required to check the consistency of a structure from exponential to polynomial in the number of disjunctions, except in cases that, it will be argued, should be very unusual in practical systems. The techniques are implemented in an experimental Japanese analyser that uses a large, existing disjunctive Japanese grammar and lexicon. Observations of the time behaviour of this analyser suggest that a significant speed gain is achieved.