这些约束用额外的语义强化层标来注模型，超出了只在基础uml中可表示的内容。

These constraints annotate models with an additional strengthening layer of semantics beyond what is expressible solely in base UML.

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但是，如果把它标为属于functional层，就意味着只能在调用框架setup函数之后运行它。

But marking it as belonging to the functional layer means that it will run only after a framework setup function has been invoked.

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如果一个服务层方法只处理只读数据，可以将它的事务标为只读，这是优化Hibernate和底层JDBC驱动的一个方法。

If a service layer method deals with only read-only data, you can mark its transaction as read-only, which is a hint to optimize Hibernate and the underlying JDBC driver.

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