此标识符必须在此节点部署到的代理实例内具有全局唯一性。

This identifier must be globally unique within the broker instance that this node is deployed.

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为了保证全局标识符的唯一性，全局标识符必须是 URI（就是说很可能包含注册的域名以保证唯一性）。

To guarantee the uniqueness of global identifiers, they must be URIs (meaning they most likely contain a domain name that has been registered to guarantee uniqueness).

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