description: The label to list in front of a code when presenting a list of possible values in a questionnaire-like fashion. package_name: rs/hl7.fhir.core derivation: constraint name: E.g. \"(a)\", \"1.\", etc. type: Extension elements: extension: index: 0 slicing: slices: extension: match: {} schema: {index: 0} max: 0 url: type: uri pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/questionnaire-optionPrefix'} index: 1 value: choices: [valueString] index: 3 valueString: {type: string, choiceOf: value, index: 4} package_version: 1.8.0 extensions: extension: {url: null, max: 0, index: 0} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/questionnaire-optionPrefix base: http://hl7.org/fhir/StructureDefinition/Extension version: null required: [value, valueString]