description: allow for a check digit and a check digit scheme to be conveyed as part of Identifier. The rules of the ID Type determine if the check digit is part of the ID value or sent separately.
package_name: hl7.fhir.r5.examples
derivation: constraint
name: checkDigit
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/identifier-checkDigit'}
    index: 1
  value:
    choices: [valueString]
    index: 3
  valueString: {type: string, choiceOf: value, index: 4}
package_version: 5.0.0-snapshot3
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/identifier-checkDigit
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 5.0.0-snapshot3
required: [valueString, value]