步骤4 .对于其他的类，重复步骤2，并将新生成的ddl命令附加到之前保存的DDL命令后面。

Step 4. Repeat Step 2 for all other classes and append the newly generated DDL commands to the previously saved ones.

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BPMN有两类重复活动，称作循环(DoWhile)和多实例(ForEach)。

BPMN has two types of repeating activities, called looping (DoWhile) and multi-instance (ForEach).

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类的职责描述了这个类在系统中所提供的服务，而且其它类不会重复提供这些服务。

A responsibility of a class describes the services that this class will provide in our system, and that no other class will provide.

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