| 摘要 |
<p>A method of paraphrasing logical forms of natural language expressions in an information processing system, such as a data base query system is disclosed. It comprises mapping logical forms to a set of Initial Trees. The structure and overall content of these trees is such as to be usable as the input to a parser for natural language analysis. Each tree has a set of syntactic features, that is, pairs of attributes and their values. A grammar is applied to the Initial Trees, in order to build a syntactic tree, whereby said Initial Trees are parsed as an unordered set of complex symbols. Each grammar rule is partly a phrase structure recognition rule and partly a specification of the translation of a node built up by the rule. The syntactic tree thus produced are evaluated, and translation strings are created by mapping all Initial Trees to (possibly null) natural language strings, as a function of their categories and the features which the grammar and the Initial Tree generator has placed on them. Also an apparatus for carrying out the method of paraphrasing logical forms of natural language expressions is disclosed. <IMAGE></p> |
