Web service composition can be divided into two classes, narndy centralized architecture and decentralized architecture, by the location of the Web services composition engine.
组合服务按照其引擎分布可分为：集中式服务组合和分布式服务组合。
A composition often manages the state of its services, similar to what a BPEL engine would do for its composed services.
组合常常对其服务的状态进行管理，与BPEL引擎处理其所组合的服务的方式相似。
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