Aggregations Element (View)
Contains field references for totals columns or calculated columns — in other words, for fields to which a function is applied.
<Aggregations Value = "Text"> <FieldRef /> ... </Aggregations>
The following example uses the Aggregations element to contain references for a totals column and a calculated column in a datasheet view. The first reference specifies that the Count function is applied to the Title column; the second reference specifies that the Sum function is applied to the Number column.