description: Indicates that validators should check that elements in the narrative have source attribution in their class attributes (boilerplate, generated, extensions and additional), and level of issue associated with the check package_name: hl7.fhir.uv.extensions derivation: constraint name: NarrativeSourceControl type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/narrative-source-control'} type: uri index: 1 value: choices: [valueCode] index: 3 valueCode: {type: code, choiceOf: value, index: 4} package_version: 5.3.0-ballot-tc extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/narrative-source-control base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.3.0-ballot-tc required: [value, valueCode]