description: This extension applies to the Patient resource and provides an indicator of whether the patient is eligible for a Closing the Gap (CTG) co-payment. package_name: hl7.fhir.au.base derivation: constraint name: ClosingTheGapRegistration type: Extension elements: url: pattern: {type: Uri, value: 'http://hl7.org.au/fhir/StructureDefinition/closing-the-gap-registration'} index: 0 value: choices: [valueBoolean] index: 2 valueBoolean: {type: boolean, choiceOf: value, index: 3} package_version: 5.1.0-preview class: extension kind: complex-type url: http://hl7.org.au/fhir/StructureDefinition/closing-the-gap-registration base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.1.0-preview required: [value, valueBoolean]