external identifier meaning in Chinese

外部标识符
外部识别符

When you use tools that impose limits on the length of external identifiers
当使用限制外部标识符长度的工具时。
Tells the parser how to deal with a specific binary file type , as well as provides a name and an external identifier for a notation
通知分析器如何处理特定的二进制文件类型，并提供表示法的名称和外部标识符。
The external identifier is used for the notation , which can allow an xml parser or its client application to locate a helper application capable of processing data in the given notation
表示法的外部标识符使xml分析器或其客户端应用程序可以找到能够处理给定表示法的数据的帮助器应用程序。