description: A logical reference (e.g. a reference to ValueSet.url) that identifies the value set/version that identifies the set of possible coded values this coding was chosen from or constrained by.
package_name: hl7.fhir.r3.examples
derivation: constraint
name: reference
type: Extension
elements:
  extension: {index: 0}
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/valueset-reference'}
    index: 1
  valueUri: {type: uri, index: 2}
package_version: 3.0.2
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/valueset-reference
base: http://hl7.org/fhir/StructureDefinition/Extension
version: null