| Source Element | Usage | Target |
| Availability | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-Availability |
| Availability.id | UseExtensionFromAncestor | - |
| Availability.extension | UseExtensionFromAncestor | - |
| Availability.availableTime | UseExtensionFromAncestor | - |
| Availability.availableTime.id | UseExtensionFromAncestor | - |
| Availability.availableTime.extension | UseExtensionFromAncestor | - |
| Availability.availableTime.daysOfWeek | UseExtensionFromAncestor | - |
| Availability.availableTime.allDay | UseExtensionFromAncestor | - |
| Availability.availableTime.availableStartTime | UseExtensionFromAncestor | - |
| Availability.availableTime.availableEndTime | UseExtensionFromAncestor | - |
| Availability.notAvailableTime | UseExtensionFromAncestor | - |
| Availability.notAvailableTime.id | UseExtensionFromAncestor | - |
| Availability.notAvailableTime.extension | UseExtensionFromAncestor | - |
| Availability.notAvailableTime.description | UseExtensionFromAncestor | - |
| Availability.notAvailableTime.during | UseExtensionFromAncestor | - |