One who oversees a control act event. Includes either a type of accountability, as in responsible party, verifier (and its children) and witness; or being an assistant to the control act event, as in secondary performer.
Legenda: Type L=leaf, S=specializable, A=abstract, D=deprecated. NullFlavor OTH (other) suggests text in originalText. HL7 V3: NullFlavors to appear in @nullFlavor attribute instead of @code.