description: An extension that contains a note package_name: ca.ab.fhir.ab derivation: constraint name: NoteAB type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'https://www.alberta.ca/fhir/ab-eorder-lab/StructureDefinition/ext-NoteAB'} index: 1 value: choices: [valueString] index: 3 valueString: {type: string, choiceOf: value, index: 4} package_version: eorder-lab-1.0.0 extensions: {} class: extension kind: complex-type url: https://www.alberta.ca/fhir/ab-eorder-lab/StructureDefinition/ext-NoteAB base: http://hl7.org/fhir/StructureDefinition/Extension version: 1.0.0 required: [valueString, value]