Level 4: Business process composition or choreography layer.
层4：业务过程合成或编排层。
The composition primitives found in BPEL4WS come primarily from many years of experience in workflow and business process integration, hence its positioning as a business process composition language.
BPEL4WS中出现的整合原语主要来自于工作流和业务流程集成方面多年的经验，因此，BPEL4WS的定位是成为一种业务流程整合语言。
A business process is created by the composition and choreography of business services provided by service components.
业务流程是通过组合和编排服务组件所提供的业务服务创建而成的。
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