势值指各层中元素可以实例化的次数，而空间值用来表示元模型层的元素是否可以进行隔层的实例化。
The potency values are the instance times of level factors and the domain field values present whether the factors can be instanced between different level.
对工作流过程模型进行分层研究，提出了三层架构的工作流过程模型：元模型层、模型层和控制模型层。
Through the hierarchical research of workflow process model, it is put forward three levels of workflow process models: meta model level, model level and control model level.
olap多维数据集具有一组特定的、类似但却更多限制性的、衍生自父多维数据集模型的元数据对象，这些对象包括多维数据集维、多维数据集层次结构、多维数据集层和一个多维数据集事实对象。
An OLAP cube has a specific set of similar but more restrictive metadata objects derived from the parent cube model, including cube dimensions, cube hierarchies, cube levels, and a cube facts object.
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