Issues certificates only to certificate holders (end entities).
只给证书所有者(最终实体)发行证书。
The system context documents how the entire system, represented as a black box, interacts with external entities (systems and end users).
系统上下文对表示为黑盒的整个系统如何与外部实体(系统和最终用户)交互做文档说明。
Behavior for these entities would end up being pushed up to the service or the view layer.
这些实体的行为最终由服务或视图层实现。
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