上下文无关文法 meaning in Chinese

cfg
context-free grammar
context-free grammer

We combine syntactic parsing and semantic analysis , use the extended context free grammar to analyze chinese . each syntactic production has a precondition judge function
汉语的分析采用扩展的上下文无关文法，每一条句法产国防科学技术大学研究生院学位论文生式都对应一个前提判断函数。
First , the paper researches the format and semantic features of iso apt in detail , next , applies regular expression to describe the definition of apt ’ s tokens and uses context - free grammar to describe apt ’ s syntax rules , last , designs the intermediate code format which keeps on the source code semantic and designs a complete module to check lexical and syntax errors of nc code by using modern compiling techniques
在代码预处理技术方面,详细研究了标准数控代码语言的格式和语义并采用现代编译技术中的正则表达式和上下文无关文法分别描述了标准数控代码语言的记号定义和语法结构定义;设计了保持源代码语义的中间标准数控代码格式,在此基础上,设计并构建了数控代码的词法和语法检查模块。