description: This Extension resource is constrained to represent the appointment cancellation reason. package_name: rs/gpc.stu3.fhir derivation: constraint name: Extension-GPConnect-AppointmentCancellationReason-1 type: Extension elements: url: pattern: {type: uri, value: 'https://fhir.nhs.uk/STU3/StructureDefinition/Extension-GPConnect-AppointmentCancellationReason-1'} type: uri index: 0 valueString: type: string short: The reason the appointment was cancelled index: 1 slicing: slices: valueString: match: {} schema: {type: string, short: The reason the appointment was cancelled, _required: true, index: 1} min: 1 package_version: assets-1.1.3 class: extension kind: complex-type url: https://fhir.nhs.uk/STU3/StructureDefinition/Extension-GPConnect-AppointmentCancellationReason-1 base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0 required: [valueString]