tailieunhanh - Báo cáo khoa học: "SAUMER: SENTENCE ANALYSIS USING METARULES"

The SAUMER system uses specifications of natural language grammars, which consist of rules and metarules. to provide a semantic interpretation of an input sentence. The SAUMER ' Specification Language (SSL) is a programming language which c o m b i n ~ some of the features of generalised phrase structure grammars (Gazdar. 1981 ). like the correspondence between syntactic and semantic rules, with definite clause grammars (DCC-s) (Pereira and Warren. 1980) to create an executable g r a m m a r specification. . | SAUMER SENTENCE ANALYSIS USING METARULES Fred Popowich Natural Language Group Laboratory for Computer and Communications Research Department of Computing Science Simon Fraser University Burnaby. . CANADA V5A 1S6 ABSTRACT The SAUMER system uses specifications of natural language grammars which consist of rules and metarules to provide a semantic interpretation of an input sentence. The SAUMER Specification Language SSL is a programming language which combines some of the features of generalised phrase structure grammars Gazdar. 1981 . like the correspondence between syntactic and semantic rules with definite clause grammars DCGs Pereira and Warren. 1980 to create an executable grammar specification. SSL rules are similar to DCG rules except that they contain a semantic component and may also be left recursive. Metarules are used to generate new rules from existing rules before any parsing is attempted. An implementation is tested which can provide semantic interpretations for sentences containing topicalisation. relative clauses passivisation. and questions. 1. INTRODUCTION The SAUMER system allows the user to specify a grammar for a natural language using rules and metarules This grammar can then be used to obtain a semantic interpretation of an input sentence. The SAUMER Specification 1 anguage SSL which IS a variation of definite clause grammars DCGs Pereira and Warren. 1980 . captures some of the features of generalised phrase structure grammars GPSGs Gazdar. 1981 Gazdar and Pullum. 1982 . like rule schemata rule transformations structured categories. slash categories. and the correspondence between syntactic and semantic rules. The semantics currently used in the system are based on Schubert and Pelletiers description in Schubert and Pelletier 1982 . which adapts the intensional logic . interpretation associated with GPSGs. into a more conventional logical notation. 2. THE SEMANTIC LOGICAL NOTATION The logical notation associated with the grammar dtffers .

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