Semantic Features And Selection Restrictions
نویسنده
چکیده
One of the essential aspects is described of an expert system (called LEXICOGRAPHER), designed to supply the user with diverse information about Russian words, including bibliographic information concerning individual lexical entries. The lexical database of the system contains semantic information that cannot be elicited from (he existing dictionaries. TJie priority is given to semantic features influencing lexical or grammatical co-occurrence restrictions. Possibilities are discussed of predicting selection restrictions on the basis of semantic features of a word in the lexicon. 1. LEXICAL DATABASE OF THE SYSTEM LEXICOGRAPHER is an expert system designed, in the first place, for the purposes of natural language processing. The work on the project is being conducted by a group of researchers including E.Belorusova, S.Krylov, E.Rakhilina, M.Filipenko c.a.; cf. Paducheva, Rakhilina 1989. The system consists of two basic components: — lexical database (LBD); — bibliographical database (BBD). LBD is a vocabulary presented in a machine readable form and consisting of several domains, as in a usual relational database. The user may get information about morphology, syntactic features, semantic features, prosody and referential features of individual lexical items. Among the semantic features that arc included or must be included in the database there are such features as: [ +Speech act verb], [ + Performative verb], [ + Verb of motion], [+Kinship term], [ + Part of the body], [ +Person (as opposed to a physical body)], [ + Parameter], etc., all in all — several dozen features. Programs now existing give the following options: — marking the vocabulary by a feature presented as a list of words; — compiling lists of words possessing a common feature or a set of features named; — compiling lists of documents containing information about the lexeme named, as well as about a given feature or a set of features; — compiling alphabetical lists of words and features mentioned in the BBD; such lists may play, for the user, the role of a catalog representing the running
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