Group Type
Indicates how the children of this element are grouped.
-
None - this element contains text only; it has no child elements that define additional structure.
-
Sequence - all children must occur (if they occur) in the order specified.
-
Choice - only one of the children can occur. If the element loops, a different child element can occur for each instance of the loop.
-
All - all of the elements must occur, and they can occur in any order.