全局模型：仅仅对一个工作流中两个活动之间的处理流程进行建模是不够的(在WSFL的术语中是指对两个Web服务之间的处理流程进行建模)。
Global model: Simply modeling the processing flow between activities within a workflow (which in WSFL-terms means modeling the processing flow between web services) is not enough.
活动是组成工作流模型的基本单位。
工作流模型的核心是业务过程的定义，包括组成过程的基本活动以及活动之间的时序关系。
The core of work flow model is the definition of business process which includes the basic activities and the temporal relation between them.
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