| Source Element | Usage | Target |
|---|---|---|
| Duration.id | UseElementSameName | Duration.id |
| Duration.extension | UseElementSameName | Duration.extension |
| Duration.value | UseElementSameName | Duration.value |
| Duration.comparator | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-Duration.comparator |
| Duration.unit | UseElementSameName | Duration.unit |
| Duration.system | UseElementSameName | Duration.system |
| Duration.code | UseElementSameName | Duration.code |