description: Expresses the linkage between the internal codes used for storage and the codes used for exchange. package_name: hl7.fhir.r5.core derivation: constraint name: permitted-value-conceptmap type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/11179-permitted-value-conceptmap'} index: 1 value: choices: [valueCanonical] index: 3 valueCanonical: {type: canonical, choiceOf: value, index: 4} package_version: 5.0.0-snapshot1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/11179-permitted-value-conceptmap base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.0.0-snapshot1 required: [valueCanonical, value]