【摘要】 本文给出并发表达式语言的文法，并描述了Petri网编辑器的语法分析过程和中间代码的产生过程。解决了Petri网在计算机中的存贮结构问题，处理了可能会出现的重名变量，实现了从井发表达式语言到安全标号的Petri网的转换工作。更多还原

【Abstract】 In this paper, the grammar of concurrent expression language is given, describing the process of the analysing of grammar and the generating of medium codes. At the same time the storage of Petri Net in memory and the dealing of the variabales which appear in the expression more than once are solved. At last the concurrent expression is converted to safe marking Petri Net.更多还原