Feature structures and nonmonotonicity
Computational Linguistics - Special issue on inheritance: I
A practical approach to multiple default inheritance for unification-based lexicons
Computational Linguistics - Special issue on inheritance: II
A rich environment for experimentation with unification grammars
EACL '89 Proceedings of the fourth 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
Defaults in unification grammar
ACL '90 Proceedings of the 28th annual meeting on Association for Computational Linguistics
COLING '90 Proceedings of the 13th conference on Computational linguistics - Volume 3
Achieving flexibility in unification formalisms
COLING '94 Proceedings of the 15th conference on Computational linguistics - Volume 2
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A common feature of recent unification-based grammar formalisms is that they give the user the ability to define his own structures. However, this possibility is mostly limited and does not include nonmonotonic operations. In this paper we show how nonmonotonic operations can also be user-defined by applying default logic (Reiter, 1980) and generalizing previous results on nonmonotonic sorts (Young and Rounds, 1993).