description: Identifies that the specified element should only appear in certain \"modes\" of operation. package_name: hl7.fhir.core derivation: constraint name: capture | display | display-non-empty | capture-display | capture-display-non-empty 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-usageMode'} index: 1 value: choices: [valueCode] index: 3 valueCode: {type: code, 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-usageMode base: http://hl7.org/fhir/StructureDefinition/Extension version: null required: [valueCode, value]