description: The name of an expression in a referenced library that determines an initial value. package_name: hl7.fhir.core derivation: constraint name: initialValue type: Extension elements: extension: {index: 0} url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/cqf-initialValue'} index: 1 valueString: {type: string, index: 2} package_version: 3.5.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/cqf-initialValue base: http://hl7.org/fhir/StructureDefinition/Extension version: null