| Extension |
| Definition | Optional Extensions Element - found in all resources |
| Control | 1..1 |
| Requirements | The ability to add extensions in a structured way is what keeps FHIR resources simple |
| RIM Mapping | N/A |
| Extension.code |
| Definition | The code that identifies the meaning of the extension by reference to the definitions |
| Control | 1..1 |
| Type | id |
| Comments | The only codes that can be used are those defined using the approved extensibility definitions. |
| RIM Mapping | N/A |
| Extension.profile |
| Definition | Source of the definition for the extension code - a namespace or a URL |
| Control | 1..1 |
| Type | uri |
| Requirements | Everyone needs to be able to define extensions, but they also must be governed properly |
| Comments | The definition may point directly to a computable or human readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition should be version specific. This will ideally be the URI for the Resource Profile defining the extension. |
| RIM Mapping | N/A |
| Extension.ref |
| Definition | Internal reference to context of the extension - a pointer to an xml:id in the same resource |
| Control | 0..1 |
| Type | idref |
| Comments | The order that extensions appear in is significant - where multiple extensions have the same ref id, they extend the target element in the order in which they appear in the extensions |
| RIM Mapping | N/A |
| Extension.mustUnderstand |
| Definition | If this element is set to true, then the containing resource element and its children are only safe to process if the reader understands this extension. |
| Control | 0..1 |
| Type | boolean |
| Must Understand | true |
| Comments | This value should be set to true if the value of the extension qualifies or negates data in other content |
| RIM Mapping | N/A |
| Extension.value[x] |
| Definition | Value of extension - may be a resource or one of a constraint set of the data types (see Extensibility in the spec for list) |
| Control | 0..1 |
| Type | * |
| RIM Mapping | N/A |
| Extension.extension |
| Definition | Nested Extensions - further extensions that are part of the extension |
| Control | 0..* |
| Type | Extension |
| RIM Mapping | N/A |
. Page versions: R5 R4B R4 R3 R2
This is an old version of FHIR retained for archive purposes. Do not use for anything else