文章分析WFMC工作流参考模型的可扩展性，提出了一个可扩展的工作流元模型。

This paper analyzes the extensibility of the workflow reference model from WFMC, then presents a extensible workflow meta model.

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设计给出了一个由过程元模型、组织元模型和数据元模型构成的三维工作流元模型。

A three-dimensional workflow meta-model is presented, which is composed ofprocess meta-model, organization meta-model and data meta-model.

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然后集中阐述了工作流元模型和工作流过程定义语言XPDL，重点分析了工作流引擎的理论和核心调度机制。

Then the paper gives the details of XPDL and workflow meta-model, and analysis the core mechanism of workflow engine.

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