Extension 
url 
value[x] Binding: ?? (extensible)
valueBoolean
valueCodeableConcept Documentation for this formatThis is the set of resources that conform to either of the profiles Best Practice (http://hl7.org/fhir/StructureDefinition/elementdefinition-bestpractice) and Best Practice (http://hl7.org/fhir/StructureDefinition/elementdefinition-bestpractice). E.g. what you have to deal with if you get resources conforming to one of them
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| Extension | 0..1 | Mark a warning invariant as 'best practice' | ||
| url | 1..1 | uri | identifies the meaning of the extension | |
| value[x] | 1..1 | Value of extension Binding: ?? (extensible) | ||
| valueBoolean | boolean | |||
| valueCodeableConcept | CodeableConcept | |||
| Documentation for this format | ||||