description: A set of codes advising a system or user which name in a set of names to select for a given purpose. package_name: rs/hl7.fhir.uv.extensions derivation: constraint name: ENUse type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/iso21090-EN-use'} type: uri index: 1 value: choices: [valueCode] index: 3 valueCode: {type: code, choiceOf: value, index: 4} package_version: 5.1.0-ballot1 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/iso21090-EN-use base: http://hl7.org/fhir/StructureDefinition/Extension version: 5.1.0-ballot1 required: [value, valueCode]