| Name | Flags | Card. | Type | Description & Constraints |
|---|---|---|---|---|
  CodeableReference | ΣN | Element | Reference to a resource or a concept Elements defined in Ancestors: id, extension | |
  concept | Σ | 0..1 | CodeableConcept | Reference to a concept (by class) |
  reference | Σ | 0..1 | Reference() | Reference to a resource (by instance) |
| Documentation for this format | ||||