description: Provides a reason why the expected value or elements in the element that is extended are missing. package_name: PCR.Core.STU3 derivation: constraint name: Data Absent Reason type: Extension elements: url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/data-absent-reason'} index: 0 valueCode: type: code short: unknown | error index: 1 slicing: slices: valueCode: match: {} schema: {type: code, short: unknown | error, index: 1} package_version: 1.0.1 class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/data-absent-reason base: http://hl7.org/fhir/StructureDefinition/Extension version: null