需求描述了所有产品功能，并且定义了实现这些功能的约束条件。
The requirements describe all the product functions, as well as the constraints under which these functions should be realized.
这些特性在“定义产品模型”小节进行了描述。
These features are described in the "Defining the product model" section.
Work Product Usage视图显示了流程的工作产品，为每个工作产品描述符在每一个活动中定义开始(入口)和结束(出口)状态。
The lower work product Usage view shows the process's work products, defining for every work product descriptor the state at the beginning (entry) and end (exit) of every activity.
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