层4：业务过程合成或编排层。
Level 4: Business process composition or choreography layer.
以一个设计或编排了来自4个来源的业务过程为例。
Let's take an example of a Business process which choreographs or orchestrates services from 4 different sources.
因此，需要考虑一些不同等级的服务聚集或编排，它可能适合不止一种实现技术。
Hence, there are several levels of service aggregation or choreography to consider, which might well be suited to more than one implementation technology.
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