This code system
http://hl7.org/fhir/reference-version-rules defines the following codes:
|
Code
|
Display
|
Definition
|
| either
|
Either Specific or independent |
The reference may be either version independent or version specific. |
| independent
|
Version independent |
The reference must be version independent. |
| specific
|
Version Specific |
The reference must be version specific. |