description: A unit that the user may choose when providing a quantity value. package_name: hl7.fhir.r5.core derivation: constraint name: unitOption type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/questionnaire-unitOption'} index: 1 value: choices: [valueCoding] index: 3 valueCoding: {type: Coding, choiceOf: value, index: 4} package_version: 4.6.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/questionnaire-unitOption base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.6.0 required: [valueCoding, value]