| Name | Flags | Card. | Type | Description & Constraints |
|---|---|---|---|---|
  Extension | N | Element | Optional Extensions Element + Rule: Must have either extensions or value[x], not both Elements defined in Ancestors: id, extension | |
  url | 1..1 | uri | identifies the meaning of the extension | |
  value[x] | C | 0..1 | * | Value of extension |
| Documentation for this format | ||||