description: The actual FUME mapping expression (as text) package_name: fume.outburn.r4 derivation: constraint name: MappingExpression type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://fhir.fume.health/StructureDefinition/mapping-expression'} index: 1 value: choices: [valueExpression] index: 3 valueExpression: {type: Expression, choiceOf: value, index: 4} package_version: 0.1.1 extensions: {} class: extension kind: complex-type url: http://fhir.fume.health/StructureDefinition/mapping-expression base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.0.1 required: [valueExpression, value]