REST is based on a small set of widely-accepted standards, such as HTTP and XML and requires far fewer development steps, toolkits and execution engines.

REST基于一组较小的被广泛接受的标准，比如HTTP和XML，这些标准不需要很多开发步骤、不需要很多工具箱和执行引擎。

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Support for BPELWS provides a standards-based approach for describing business workflows, and ensures a measure of interoperability among workflow execution engines.

对BPELWS的支持提供了描述业务工作流的基于标准的方法，并且确保了工作流执行引擎间的互操作性的方法。

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Managing of the simultaneous execution of multiple asynchronous process instances under resource constraints is one of the key challenges of business process engines.

在资源约束之下，管理多个异步处实例的同步执行，是业务流程引擎的主要挑战之一。

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The right actions may require workflow or process orchestration, whether manual or via software engines, to control the flow of work and to trigger the execution of human (or automated activities) at the right time.

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