BPEL allows composition of web services and is thus the top-down approach to SOA -the process oriented approach to SOA.

BPEL允许Web服务的组合，是自上而下的、基于过程的SOA方法。

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Policy sets provide reusable quality of service configurations, which can be associated with the SCA Web services bindings defined in a composition unit.

策略集提供可重用的服务质量配置，这些配置可以与组合单元中定义的SCA Web服务绑定相关联。

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The involved web services do not know (and do not need to know) that they are involved into a composition and that they are a part of a higher business process.

所涉及的Web服务并不知道(也不需要知道)它们所涉及到的组合，它们只是一个更高的业务流程的一部分。

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