description: Provides a reason why the expected value or elements in the element that is extended are missing. package_name: rs/bonsai.poc.second.test.rc1 derivation: constraint name: Data Absent Reason type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/data-absent-reason'} type: uri index: 1 value: choices: [valueCode] index: 3 valueCode: {type: code, choiceOf: value, index: 4} package_version: 1.3.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/data-absent-reason base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.0.1 required: [value, valueCode]