应用程序验证标识符(将用户定向到其OP以进行登录)。
The application verifies the Identifier (by directing the user to her OP to sign in).
当对两个应用程序管理的客户数据进行集成时，两个应用程序中可能存在标识符不彼此匹配的相同客户。
When integrating the customer data managed by the two applications, the same customer can exist in both applications with identifiers that do not match.
其次，因为这个上下文中uri是标识符，应用程序必须逐字符地匹配该uri。
Secondly, because in this context URIs are identifiers, your application must match the URI letter-for-letter.
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