公共端，是电脑程序中的端口。
允许服务订阅者仅查看公共端点。
Service subscribers are allowed to view only public endpoints.
如果两条边恰有一个公共端点，就说它们是邻接的。
Two edges are adjacent if they have exactly one common end vertex.
允许订阅者查看有关订阅服务的详细信息，如公共端点和相关服务。
Subscribers are allowed to view more details of the subscribed service, such as the public endpoints and the dependent services.
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