A conforming implementation may have extensions (including additional library functions), provided they do not alter the behavior of any well-formedprogram.
只要这些扩展不会改变任何良好形式程序的行为，符合标准的实现就可以带有扩展(包括附加的库功能)。
2
This program should send responses only to complete, well-formed input.
该程序仅将响应发送到完整的、格式良好的输入。
3
When a client or supervisor dictates how a program should process well-formed input data, take the opportunity to agree in detail on how the program should act in case of error.