This is the set of resources that conform to either of the profiles Resource Derivation Reference (http://hl7.org/fhir/StructureDefinition/derivation-reference) and Resource Derivation Reference (http://hl7.org/fhir/StructureDefinition/derivation-reference). E.g. what you have to deal with if you get resources conforming to one of them
| Name | Flags | Card. | Type | Description & Constraints |
|---|---|---|---|---|
  Extension | C | 0..* | References a location within a set of source text from which the discrete information described by this Resource/Element was extracted. ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both der-1: Cannot have length if offset is missing. | |
  extension | 0..* | Extension | Additional content defined by implementations ele-1: All FHIR elements must have a @value or children ext-1: Must have either extensions or value[x], not both | |
  url | 1..1 | uri | identifies the meaning of the extension | |
| Documentation for this format | ||||