Values.GroupDefinitionSourceRepresents a group when you specify a group by criteria or in the response to a query with a specific grouping.
type nonrec t = {type_ : GroupDefinitionType.t option;The string that represents the type of group.
*)key : GroupDefinitionKey.t option;The string that represents a key for a specified group.
*)}val to_value :
t ->
[> `Structure of
(string * [> `Enum of string | `String of GroupDefinitionKey.t ]) list ]