The value of @typeCode shall be drawn from value set 2.16.840.1.113883.1.11.19600x_EncounterParticipant (DYNAMIC)
Constraint
MAY contain zero or more [0..*]encounterParticipantelements. If present, the encounterParticipant/assignedEntity element SHALL have at least one of assignedPerson or representedOrganization element present.