现在，我们已经完成了对订阅对象的描述，该将订阅和用户组分组到 订阅集了。

Now we have finished describing our Subscription object, and it's time to group our subscriptions and users group into a subscription set.

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设计模式是对被用来描述特定场景下解决一般设计问题的类和相互通信的对象的描述。

Design Pattern is used to describe the classes that resolve general design issues and the object that communicate with each other in specific scenes.

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migrate default values：将UD p值导入为元数据，并导入到对象的描述中。

Both, migrate default values: Import the UDP value, both as metadata and in the object's description.

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