Required String attribute. The name of the hierarchy to which the members contained by the Members element belong.
When a client application sets the AxisFormat property to ClusterFormat, the members on each axis are divided into clusters in which each cluster represents a cross-product between ordered sets of members from each hierarchy. Each Axis element consists of one or more CrossProduct elements. Every CrossProduct element contains a Members element for each hierarchy on the axis. The Members element, in turn, contains one Member element for each member of the specified hierarchy included in the cross-product.
The following example illustrates the structure of the Members element when a client specifies ClusterFormat for the AxisFormat XMLA property, given the following members for the axis: