description: Identifier holding a danish [CVR](https://datacvr.virk.dk/data/) number.
package_name: hl7.fhir.dk.core
derivation: constraint
name: CVRIdentifier
type: Identifier
elements:
  use:
    pattern: {type: Code, value: official}
    index: 0
  system:
    pattern: {type: Uri, value: 'http://cvr.dk'}
    index: 1
  value:
    constraint:
      CVR-length: {human: CVR must be exactly 8 numeric characters long, source: 'http://hl7.dk/fhir/core/StructureDefinition/dk-core-cvr-identifier', severity: error, expression: 'value.matches(''^[0-9]{8}$'')'}
      CVR-modulus-11:
        human: CVR must pass the modulus 11 check
        source: http://hl7.dk/fhir/core/StructureDefinition/dk-core-cvr-identifier
        severity: error
        expression: |-
          ((
              (value.substring(0,1).toInteger()*2)+
              (value.substring(1,1).toInteger()*7)+
              (value.substring(2,1).toInteger()*6)+
              (value.substring(3,1).toInteger()*5)+
              (value.substring(4,1).toInteger()*4)+
              (value.substring(5,1).toInteger()*3)+
              (value.substring(6,1).toInteger()*2)+
              (value.substring(7,1).toInteger()*1)) mod(11)=0)
    index: 2
package_version: 1.1.0
class: complex-type
kind: complex-type
url: http://hl7.dk/fhir/core/StructureDefinition/dk-core-cvr-identifier
base: http://hl7.org/fhir/StructureDefinition/Identifier
version: 1.1.0
required: [value, system]