自然语言查询系统中的句法分析与算法实现

为了让更多的不熟悉计算机技术的用户使用他们熟悉的方式从数据库中查询信息，利用汉语自然语言进行查询成为当前的一个热点问题。由于汉语语句的复杂性，建立自然语言理解的形式化模型一直是研究的难点。本文针对当前研究的热点和难点问题，通过分析数据库中常用的SQL句型，把查询语句划分为六类，提出了受限汉语规则和基于受限汉语的上下文无关文法来尝试解决自然语言处理中的语句理解问题，并给出了详细的算法描述。

Syntax analysis and arithmetic realization of natural language query systems

Using the Chinese natural language to retrieve information from database is becoming a hot issue in order to facilitate users who aren't good at computer technologies to get useful information by their familiar means.Because of the complexity of Chinese,building a formalized model comprehended by natural language is always a difficult problem.By analysis of the normal SQL sentences used to get information from databases,the query sentences were divided into six classes.Then,rules of forming restrictive Chinese and corresponding context irrespective grammars were proposed,trying to solve the difficult comprhension problems in natural language processing,and the detailed algorithm was given in this paper.