In MDX in SSAS the term "attribute" occasionally gets used interchangeably with "hierarchy" and "level", but it's not technically accurate. In SSAS, MDX has concepts of Dimensions, Hierarchies and Levels, but not Attributes. Attributes and Attribute Relationships are design time concepts that are understood by the storage engine, but they are not directly exposed in the MDX language. Attributes actually map to levels (or properties) in MDX. I think the confusion comes about because, by default, an ......