description: Identifies the relative preference of alternative performers when the request lists multiple performers. package_name: hl7.fhir.core derivation: constraint name: performerOrder type: Extension elements: extension: {index: 0} url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/request-performerOrder'} index: 1 valueInteger: {type: integer, index: 2} package_version: 3.5.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/request-performerOrder base: http://hl7.org/fhir/StructureDefinition/Extension version: null