Values.GetSystemTemplateRequestSourceGets a system.
type nonrec t = {id : Urn.t;The ID of the system to get. This ID must be in the user's namespace. The ID should be in the following format. urn:tdm:REGION/ACCOUNT ID/default:system:SYSTEMNAME
*)revisionNumber : Version.t option;The number that specifies the revision of the system to get.
*)}