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。
WF in.net FX 4 includes a composable set of workflow styles, a unification of rules and activities as well as improved data binding, scoping, and expression support.
NETFX4里的WF包括可组装的工作流style，统一的规则和行为，以及改进的数据绑定、定界和表达式支持。
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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