本文假设多维数据集模型的维具有平衡的层次结构和标准部署。

This paper assumes the dimensions of the cube model have hierarchies of balanced type and standard deployment.

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对于每个多维数据集维，一个多维数据集只能定义一个多维数据集层次结构；但是在多维数据集模型中，一个维可以有多个层次结构。

A cube can have only one cube hierarchy defined for each cube dimension, but a dimension can have many hierarchies that are defined for the cube model.

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对于查询中的每个(维、层次结构、级)集，判断使用哪些维属性。

For each (dimension, hierarchy, level) set in the query, determine the attributes from the dimension to be in the query.

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