TAILIEUCHUNG - Báo cáo khoa học: "STRUCTURAL NON-CORRESPONDENCE IN TRANSLATION"

Kaplan et al (1989) present an approach to machine translation based on co-description. In this paper we show that the notation is not as natural and expressive as it appears. We first show that the most natural analysis proposed in Kaplan et al (1989) cannot in fact cover the range of data for the important translational phenomenon in question. This contribution extends the work reported on in Sadler et al (1989) and Sadler et al (1990). We then go on to discuss alternatives which depart from or extend the formalism proposed in Kaplan et al (1989) in various. | STRUCTURAL NON-CORRESPONDENCE IN TRANSLATION Louisa Sadler Henry s. Thompson Dept of Language and Linguistics Human Communication Research Centre University of Essex Wivenhoe Park Colchester CO4 3SQ Essex UK. louisa@ ABSTRACT Kaplan et al 1989 present an approach to machine translation based on co-description. In this paper we show that the notation is not as natural and expressive as it appears. We first show that the most natural analysis proposed in Kaplan et al 1989 cannot in fact cover the range of data for the important translational phenomenon in question. This contribution extends the work reported on in Sadler et al 1989 and Sadler et al 1990 . We then go on to discuss alternatives which depart from or extend the formalism proposed in Kaplan et al 1989 in various respects pointing out some directions for further research. The strategies discussed have been implemented. 0. Introduction Recent work in LFG uses the notion of projection to refer to linguistically relevant mappings or correspondences between levels whether these mappings are direct or involve function composition Halvoisen Kaplan 1988 Kaplan 1987 Kaplan et al 1989 . Mapping functions such as Ip from c to f structure and Ơ from c to semantic structure are familiar from the LFG literature. Kaplan et al 1989 extend this approach to Machine Translation by defining two translation functions T between f-structures and T between semantic structures . By means of these functions one can co-describe elements of source and target f-structures and s-structures respectively. Achieving translation can be thought of in terms of specifying and resolving a set of constraints on target structures constraints which are expressed by means of the T and t functions. The formalism permits a wide variety of source-target correspondences to be expressed T and can be composed as can T and Ơ. The approach allows for equations specifying translations to be added to lexical entries and source language .

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