description: Identifies that the specified element should only appear in certain \"modes\" of operation. package_name: hl7.fhir.r5.examples derivation: constraint name: usageMode type: Extension elements: extension: {index: 0} url: 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: 5.0.0-snapshot1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/questionnaire-usageMode base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.0.0-snapshot1 required: [valueCode, value]