TAILIEUCHUNG - Báo cáo khoa học: "DESIGN AND IMPLEMENTATION OF A LLXICAL DATA BASE "

This paper is concerned with the specifications and the implementation of a particular concept of word-based lexicon to be used for large natural language processing systems such as machine translation systems, and compares it with the morpheme-based conception of the lexicon traditionally assumed in computational linguistics. It will be argued that, although less concise, a relational word-based lexicon is superior to a morpheme-based lexicon from a theoretical, computational and also practical viewpoint. . | DESIGN AND IMPLEMENTATION OF A LEXICAL DATA BASE Eric Wehrli Department of Linguistics . 405 Hilgard Ave Los Angeles CA 90024 ABSTRACT This paper is concerned with the specifications and the implementation of a particular concept of word-based lexicon to be used for large natural language processing systems such as machine translation systems and compares it with the morpheme-based conception of the lexicon traditionally assumed in computational linguistics. It will be argued that although less concise a relational word-based lexicon is superior to a morpheme-based lexicon from a theoretical computational and also practical viewpoint. INTRODUCTION It has been traditionally assumed by computational linguists and particularly by designers of large natural language processing systems such as machine translation systems that the lexicon should be limited to lexical information that cannot be derived by rules. According to this view a lexicon consists of a list of basic morphemes along with irregular or unpredictable words. In this paper I would like to reexamine this traditional view of the lexicon and point out some of the problems it faces which seriously question the general adequacy of this model for natural language processing. As a trade-off between the often conflicting linguistic computational and also practical considerations an alternative conception of the lexicon will be discussed largely based on Jackendoffs 1975 proposal. According to this view lexical entries are fully-specified but related to one another. First developed for a French parser cf. Wehrli 1984 this model has been adopted for an English parser in development as well as for the prototype of a French-English translation system. This paper is organized as follows the first section addresses the general issue of what constitutes a lexical entry as well as the question of the relation between lexicon and morphology from the point of view of both theoretical linguistics and computational .

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