在这种情况下，属性应该在每一步中传递。

In such a situation, the properties should be passed through for each step.

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要在多维数据集模型的另一个切片上创建分组集，应该创建一个新的分组集，其中至少要包含新切片中每一级的级键属性。

To create a grouping set at another slice of the cube model, create a new grouping set that includes, at a minimum, the level key attributes of each level in the new slice.

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一个直行映射，即一个XPath表达式的集合，它找出形成表格每列的模型对象的属性。

A column mapping that is a set of XPath expressions, which find attributes of those model objects, forming the columns of the table.

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