description: The formal URI for the code system.  I.e. ValueSet.codeSystem.system (or its equivalent).
package_name: hl7.fhir.core
derivation: constraint
name: systemRef
type: Extension
elements:
  extension: {index: 0}
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/valueset-systemRef'}
    index: 1
  valueUri: {type: uri, index: 2}
package_version: 3.2.0
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/valueset-systemRef
base: http://hl7.org/fhir/StructureDefinition/Extension
version: null