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。

youdao

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。

youdao

In order for this composition to occur, we need a way of composing atomic, fine-grained Web services into coarse-grained business services.

为了使这个组成发生，我们需要有一种方式的组成原子，细粒度网络服务纳入粗粒度的业务服务。

youdao