http://hl7.org/fhir/StructureDefinition/_datatype|5.2.0
Used when the actual type is not allowed by the definition of the element. In general, this should only arise when wrangling between versions using cross-version extensions - see [Cross Version Extensions](versions.html#extensions).
| Name | Flags | Card | Type | Description & Constraints |
|---|---|---|---|---|
Extension | 0..1 | Alternative datatype name (for cross version extensions) | ||
| ?..0 | ||||
| ?..? | ||||
| 1..? | ||||
| 1..? | string |