The lexical handler doesn't do much: It simply forwards the events to the next filter in the pipe, but the XSLT processor requires them. 词法处理程序并不做很多事情:它只将事件转发给管道中的下一个过滤器,但XSLT处理器需要它们。
The system consists of three layers, i.e. interface language, lexical/ syntactic parser, and command processor. 该系统包括接口语言、词法和语法分析器、命令处理程序三层。