description: null package_name: synapxe.hsar derivation: constraint name: extension-Patient-enrollmentPeriod type: Extension elements: id: {index: 0} extension: {index: 1} url: pattern: {type: Uri, value: 'http://ihis.sg/extension/enrollment-period'} index: 2 value: choices: [valuePeriod] index: 4 valuePeriod: {type: Period, choiceOf: value, index: 5} value[x]: elements: start: {short: 'Sample Value: "2022-08-22T12:00:12+08:00"', index: 6} end: {short: 'Sample Value: "2022-08-22T12:00:12+08:00"', index: 7} required: [start] package_version: 1.0.0 extensions: {} class: extension kind: complex-type url: http://ihis.sg/extension/enrollment-period base: http://hl7.org/fhir/StructureDefinition/Extension version: null