description: External Identifiers associated with this element - these are identifiers that are associated with the concept this element represents. package_name: rs/hl7.fhir.core derivation: constraint name: External Identifier associated with this element type: null elements: extension: {name: extension, index: 0} url: type: uri pattern: {type: uri, value: 'http://hl7.org/fhir/StructureDefinition/elementdefinition-identifier'} index: 1 value: choices: [valueIdentifier] index: 3 valueIdentifier: {type: Identifier, choiceOf: value, index: 4} package_version: 1.4.0 extensions: {} class: datatype kind: datatype url: http://hl7.org/fhir/StructureDefinition/elementdefinition-identifier base: http://hl7.org/fhir/StructureDefinition/Extension version: null required: [value, valueIdentifier]