Defines the interface implemented by the workflow expression evaluation component that provides a context frame for expression evaluation.
定义接口，该接口由为表达式计算提供上下文帧的工作流表达式计算组件实现。
Workflow modeling technique is always one of important research tasks of workflow, including workflow model definition and sematic formalized expression method and so on.
工作流建模技术一直是工作流技术研究的重要课题之一，它的研究范围包括：工作流模型定义、语义的形式化表示方法等。
Workflow modeling technique is always one of important research tasks of workflow, including workflow model definition and sematic formalized expression method and so on.
工作流建模技术一直是工作流技术研究的重要课题之一，它的研究范围包括：工作流模型定义、语义的形式化表示方法等。
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