add to Provenance and AuditEvent - basedOn and encounter elements following the Event pattern, and define search parameters for both Place them after activity and before agent baseOn 0..* Reference(Request) - workflow authorization which this event occurred Allows tracing of authorization for the events and tracking whether proposals/recommendations were acted upon. encounter 0..1 Reference(Encounter) - Encounter within which this event occurred or which the event is tightly associated. This will typically be the encounter the event occurred, but some events may be initiated prior to or after the official completion of an encounter but still be tied to the context of the encounter (e.g. pre-admission lab tests).