Temporal ontology and temporal reference
Computational Linguistics - Special issue on tense and aspect
Eventualities in a natural language understanding system
Proceedings of the workshop on Sorts and types in artificial intelligence
Artificial Intelligence - Special volume on natural language processing
The acquisition of lexical semantics for spatial terms: a connectionist model of perceptual categorization
Language and Spatial Cognition
Language and Spatial Cognition
Propositional and Depictorial Representations of Spatial Knowledge: The Case of Path-Concepts
Proceedings of the International Symposium on Natural Language and Logic
Discourse relations and defeasible knowledge
ACL '91 Proceedings of the 29th annual meeting on Association for Computational Linguistics
ACL '88 Proceedings of the 26th annual meeting on Association for Computational Linguistics
THE IMPERFECTIVE PARADOX and trajectory-of-motion events
ACL '93 Proceedings of the 31st annual meeting on Association for Computational Linguistics
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The first part of the paper develops a novel, sortally-based approach to the problem of aspectual composition. The account is argued to be superior on both empirical and computational grounds to previous semantic approaches relying on referential homogeneity tests. While the account is restricted to manner-of-motion verbs, it does cover their interaction with mass terms, amount phrases, locative PPs, and distance, frequency, and temporal modifiers. The second part of the paper describes an implemented system based on the theoretical treatment which determines whether a specified sequence of events is or is not possible under varying situationally supplied contraints, given certain restrictive and simplifying assumptions. Briefly, the system extracts a set of contraint equations from the derived logical forms and solves them according to a best-value metric. Three particular limitations of the system and possible ways of addressing them are discussed in the conclusion.