base element
These are the elements at the lowest level of the
		dimension hierarchy. That is, these elements have no children. In a cube,
		actual physical data is stored in cube cell addresses that are made up of only
		base elements. A cube cell that contains one or more consolidated or rules
		elements in its cell address, is a calculated cell and cannot store an item of
		data. The values of these cells are calculated from data in base cells.