description: Initial value for a question answer as determined by an evaluated expression. package_name: ca.on.health.sadie derivation: constraint name: InitialExpressionExtension type: Extension elements: url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-initialExpression'} index: 0 valueExpression: {type: Expression, index: 1} package_version: 1.4.7 class: extension kind: complex-type url: http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-initialExpression base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.7.0