层4：业务过程合成或编排层。
Level 4: Business process composition or choreography layer.
此外，业务过程本身也可以是“合成”事件的源，而这些事件又可以反过来反馈到事件处理系统。
Additionally, business processes could themselves be the source of "synthetic" events which can in turn feed back into the event processing system.
SOA的一个抽象观点将它描述为与业务过程结合在一起的合成服务的部分分层架构。
An abstract view of SOA depicts it as a partially layered architecture of composite services that align with business processes.
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