The mathematics of inheritance systems
The mathematics of inheritance systems
Information-based syntax and semantics: Vol. 1: fundamentals
Information-based syntax and semantics: Vol. 1: fundamentals
Proceedings of the Seventh Conference (AISB89) on Artificial Intelligence and Simulation of Behaviour
An interpretation of negation in feature structure descriptions
Computational Linguistics
EACL '89 Proceedings of the fourth conference on European chapter of the Association for Computational Linguistics
A logical semantics for feature structures
ACL '86 Proceedings of the 24th annual meeting on Association for Computational Linguistics
Structure-sharing in lexical representation
ACL '85 Proceedings of the 23rd annual meeting on Association for Computational Linguistics
Defaults in unification grammar
ACL '90 Proceedings of the 28th annual meeting on Association for Computational Linguistics
A simple reconstruction of GPSG
COLING '86 Proceedings of the 11th coference on Computational linguistics
Inheritance in natural language processing
Computational Linguistics - Special issue on inheritance: I
Default representation in constraint-based frameworks
Computational Linguistics
Lexical rules in constraint-based grammars
Computational Linguistics
Robust grammatical analysis for spoken dialogue systems
Natural Language Engineering
Representing a system of lexical types using default unification
EACL '99 Proceedings of the ninth conference on European chapter of the Association for Computational Linguistics
A logical semantics for nonmonotonic sorts
ACL '93 Proceedings of the 31st annual meeting on Association for Computational Linguistics
ACL '95 Proceedings of the 33rd annual meeting on Association for Computational Linguistics
User-defined nonmonotonicity in unification-based formalisms
ACL '95 Proceedings of the 33rd annual meeting on Association for Computational Linguistics
A lexicalist account of Icelandic case marking
COLING '92 Proceedings of the 14th conference on Computational linguistics - Volume 1
Computational Linguistics
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Unification-based grammar formalisms use feature structures to represent linguistic knowledge. The only operation defined on feature structures, unification, is information-combining and monotonic. Several authors have proposed nonmonotonic extensions of this formalism, as for a linguistically adequate description of certain natural language phenomena some kind of default reasoning seems essential. We argue that the effect of these proposals can be captured by means of one general, nonmonotonic, operation on feature structures, called default unification. We provide a formal semantics of the operation and demonstrate how some of the phenomena used to motivate nonmonotonic extensions of unification-based formalisms can be handled.