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: Extension elements: extension: index: 0 slicing: slices: extension: match: {} schema: {index: 0} max: 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 refers: ['http://hl7.org/fhir/StructureDefinition/ConceptMap'] index: 4 package_version: 1.8.0 extensions: extension: {url: null, max: 0, index: 0} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/11179-permitted-value-conceptmap base: http://hl7.org/fhir/StructureDefinition/Extension version: null required: [valueReference, value]