Conversion from Phrase Structural Tree Representing Comparative Expression to Corresponding Meaning Structure

摘要

First in this paper, three types of dependency structure to express comparative sentence is shown. Consequently, it is shown that dependency structure and LFG(Lexical Functional Grammar) express the same data structure. They are notational variants of each other. Mext, the transformation method to generate a dependency structure from a phrase structure is proposed. This method is composed through an improvement applied to the method formerly proposed by the author of this paper. The improvement has simplified the treatment of the principal or governor portion at a dependency structure. The principle of this method is illustrated with the aid of an example. Finally, the transformation method is applied to the phrase structure obtained from a sentence of comparison to generate corresponding dependency structure. Here, it is shown that node attribute is necessary to restore the abbreviated portion at input sentence.