description: This extension describes the source of the Service Request. package_name: fhir.r4.ukcore.stu3.currentbuild derivation: constraint name: ExtensionUKCoreSourceOfServiceRequest type: Extension elements: url: pattern: {type: uri, value: 'https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-SourceOfServiceRequest'} type: uri index: 0 value: short: A set of codes that describe the source of the service request. choices: [valueCodeableConcept] index: 2 valueCodeableConcept: {type: CodeableConcept, short: A set of codes that describe the source of the service request., choiceOf: value, index: 3} package_version: 0.0.15-pre-release class: extension kind: complex-type url: https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-SourceOfServiceRequest base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.2.0 required: [value, valueCodeableConcept]