description: This extension extends the DiagnosticReport reference elements, in order to allows a Device to be referenced where it would otherwise be unavailable. package_name: fhir.r4.ukcore.stu3.currentbuild derivation: constraint name: ExtensionUKCoreDeviceReference type: Extension elements: url: pattern: {type: uri, value: 'https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-DeviceReference'} type: uri index: 0 value: short: An additional Device reference for a DiagnosticReport. choices: [valueReference] index: 2 valueReference: type: Reference short: An additional Device reference for a DiagnosticReport. choiceOf: value refers: ['http://hl7.org/fhir/StructureDefinition/Device'] index: 3 package_version: 0.0.10-pre-release class: extension kind: complex-type url: https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-DeviceReference base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.1.0 required: [value, valueReference]