Defines the category level that repeats with each category group in a chart.
|Data type and length||None|
|Cardinality||0-1: Optional element that can occur once or not at all. See "Remarks" for additional information.|
The CategoryGrouping element must have one and only one child element: either DynamicCategories or StaticCategories.
The group labels that are displayed on the axis are defined by the Label element contained within the Grouping element. The Label element that is a child of the DynamicCategories element contains a separate label to display on the axis.