description: Provides a reason why the expected value or elements in the element that is extended are missing. package_name: rs/eReferralOntarioNew.core derivation: constraint name: Data Absent Reason type: Extension elements: extension: {index: 0} url: type: uri pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/data-absent-reason'} index: 1 valueCode: type: code binding: {strength: required, valueSet: 'http://hl7.org/fhir/ValueSet/data-absent-reason|4.0.0', bindingName: DataAbsentReason} index: 2 package_version: 0.10.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/data-absent-reason base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.0.0