关键字触发器并不是UML2的一部分，它只是用来强调这些操作是如何实现的。
The trigger keyword is not part of UML 2 and is included only to highlight how these operations are realized.
也可以用VALUES关键字或在触发器中调用它。
It can also be invoked with the VALUES keyword, and it can be invoked inside a trigger.
也可以用VALUES关键字或在触发器中调用它。
It can also be invoked with the VALUES keyword, and it can be invoked inside a trigger.
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