TAILIEUCHUNG - Báo cáo khoa học: "Restriction and Correspondence-based Translation"

Kaplan et al. (1989) present a framework for translation based on the description and correspondence concepts of LexicalFunctional Grammar (Kaplan and Bresnan, 1982). Certain phenomena, in particular the head-switching of adverbs and verbs, seem to be problematic for that approach. In this paper we suggest that these difficulties are more properly considered as the result of defective monolingual analyses. We propose a new description-language operator, restriction, to permit a succinct formal encoding of the informal intuition that semantic units sometimes correspond to subsets of functional information. . | Restriction and Correspondence-based Translation Ronald M. Kaplan Xerox Palo Alto Research Center 3333 Coyote Hill Road_ Palo Alto California 94304 USA Jiirgen Wedekind Institute for Natural Language Processing University of Stuttgart Azenbergstr. 12_______________ D-7000 Stuttgart 1 FRG Juergen@ Abstract Kaplan et al. 1989 present a framework for translation based on the description and correspondence concepts of Lexical-Functional Grammar Kaplan and Bresnan 1982 . Certain phenomena in particular the head-switching of adverbs and verbs seem to be problematic for that approach. In this paper we suggest that these difficulties are more properly considered as the result of defective monolingual analyses. We propose a new description-language operator restriction to permit a succinct formal encoding of the informal intuition that semantic units sometimes correspond to subsets of functional information. This operator in conjunction with an additional recursion provided by a description-by-analysis rule is the basis of a more adequate account of head-switching that preserves the advantages of correspondence-based translation. 1. Introduction Kaplan et al. 1989 present a framework for translation based on the description and correspondence concepts of Lexical-Functional Grammar Kaplan and Bresnan 1982 . LFG formulates the syntactic dependencies and generalizations of natural languages in terms of the properties of formal structures of different types ordinary phrase-structure trees represent the surface constituency of sentences while hierarchical finite functions represent their underlying grammatical relations. The structures for a particular sentence are those that satisfy descriptions produced from annotated phrase-structure rules and lexical entries. The description of the more abstract functional structure is determined by the dominance and precedence relations of the superficial constituent structure given the assumption .

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