In chapter 4, it analyzes the composition and processing method of the datagram, uses the datagram protocol to define the composition and processing method of the datagram and also designs a grammar to parse the protocol.

• 第四章则重点研究了银行数据报文的组成方式,使用报文协议来定义数据报文的组成以及交易处理方式,并设计了对报文协议进行解析的文法;