description: Expresses the linkage between the internal codes used for storage and the codes used for exchange. package_name: hl7.fhir.core derivation: constraint name: Mapping from permitted to transmitted type: null elements: extension: {name: extension, index: 0} url: type: uri pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/11179-permitted-value-conceptmap'} index: 1 value: choices: [valueReference] index: 3 valueReference: {type: Reference, choiceOf: value, index: 4} package_version: 1.4.0 extensions: {} class: datatype kind: datatype url: http://hl7.org/fhir/StructureDefinition/11179-permitted-value-conceptmap base: http://hl7.org/fhir/StructureDefinition/Extension version: null required: [valueReference, value]