Summary: as we determined last week, UML activity diagrams document the logic of a single operation or method, a single use case, or the flow of logic of a business process.

简介：正如我们上周已确定的那样，UML活动图记录单个操作或方法的逻辑、单个用例或商业过程的逻辑流程。

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Here, you use it to control the flow between the steps of your single-screen checkout process.

这里，我们使用它来控制单一屏幕的结帐过程各步骤间的流程。

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The three steps in the process would be implemented as services, and the linear flow of execution based on a single order request defines the business process.

流程中的三个步骤将实现为服务，基于单个订单请求的执行线性流就定义了此业务流程。

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