请参阅本绿洲 SAML 规范的 SAML 核心 pdf.

SP 和 IdP 通常就一个主题相互交流.该主题应通过 NAME-IDentifier 进行标识，该标识应采用某种格式，以便对方根据该格式轻松识别它.

SP and IdP usually communicate each other about a subject. That subject should be identified through a NAME-IDentifier , which should be in some format so that It is easy for the other party to identify it based on the Format.

所有这些

1.urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified [default]

2.urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress

3.urn:oasis:names:tc:SAML:2.0:nameid-format:persistent

4.urn:oasis:names:tc:SAML:2.0:nameid-format:transient

是名称标识符的格式.

SAML 1 中临时 ID 的名称格式为 urn:mace:shibboleth:1.0:nameIdentifier 在 SAML 2 中是 urn:oasis:names:tc:SAML:2.0:nameid-format:transient

瞬态适用于 SAML 核心]

表示元素的内容是一个标识符，带有瞬态语义，应该被视为不透明和临时的依赖方的价值.

Indicates that the content of the element is an identifier with transient semantics and SHOULD be treated as an opaque and temporary value by the relying party.

Unspecified 可以使用，这完全取决于实体实现自己的意愿.

Unspecified can be used and it purely depends on the entities implementation on their own wish.