description: Provides a coded expression for the content represented in a string. package_name: rs/hl7.fhir.r5.core derivation: constraint name: SC-coding type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/iso21090-SC-coding'} type: uri index: 1 value: choices: [valueCoding] index: 3 valueCoding: {type: Coding, choiceOf: value, index: 4} package_version: 4.6.0 extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/StructureDefinition/iso21090-SC-coding base: http://hl7.org/fhir/StructureDefinition/Extension version: 4.6.0 required: [value, valueCoding]