用例描述用例流程的细节信息，包括简单介绍，步骤，选择的流程。
Use case description Details of the use case flow, including brief description, steps, alternate flows.
这包括模式，服务描述，业务流程设计模型，策略文档等等。
This includes such things as schemas, service descriptions, business process design models, policy documents and so on.
流程定义首先描述包括什么部分(Web服务)以及它们扮演什么角色。
A process definition begins with describing what parties (Web services) are involved and what roles they play.
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