description: null package_name: synapxe.hsar.hsg derivation: constraint name: extension-Patient-nilIndicator type: Extension elements: id: {index: 0} extension: {index: 1} url: pattern: {type: Uri, value: 'http://ihis.sg/extension/nil-indicator'} index: 2 value: choices: [valueBoolean] index: 4 valueBoolean: {type: boolean, choiceOf: value, index: 5} package_version: 4.3.0-v3 extensions: {} class: extension kind: complex-type url: http://ihis.sg/extension/nil-indicator base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.3.0-v3