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: 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/elementdefinition-identifier'} index: 1 value: choices: [valueIdentifier] index: 3 valueIdentifier: {type: Identifier, choiceOf: value, 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/elementdefinition-identifier base: http://hl7.org/fhir/StructureDefinition/Extension version: null required: [value, valueIdentifier]