在外部安全提供者中添加用户和组实体。
Add user and group entities in an external security provider.
PUBLIC不是外部安全设施中定义的真正的组。
PUBLIC is not actually a group defined in the external security facility.
为了执行验证、映射和授权，就需要使用外部安全提供者。
To perform the authentication, mapping, and authorization, an external security provider is required.
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