Transportability and generality in a natural-language interface system
Readings in natural language processing
The logic of typed feature structures
The logic of typed feature structures
Natural language understanding (2nd ed.)
Natural language understanding (2nd ed.)
CYC: a large-scale investment in knowledge infrastructure
Communications of the ACM
Time, tense and aspect in natural language database interfaces
Natural Language Engineering
Enabling technology for multilingual natural language generation: the KPML development environment
Natural Language Engineering
Clustering Syntactic Positions with Similar Semantic Requirements
Computational Linguistics
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Selectional restrictions are semantic sortal constraints imposed on the participants of linguistic constructions to capture contextually-dependent constraints on interpretation. Despite their limitations, selectional restrictions have proven very useful in natural language applications, where they have been used frequently in word sense disambiguation, syntactic disambiguation, and anaphora resolution. Given their practical value, we explore two methods to incorporate selectional restrictions in the HPSG theory, assuming that the reader is familiar with HPSG. The first method employs HPSG's BACKGROUND feature and a constraint-satisfaction component pipe-lined after the parser. The second method uses subsorts of referential indices, and blocks readings that violate selectional restrictions during parsing. While theoretically less satisfactory, we have found the second method particularly useful in the development of practical systems.