<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-Reference" />
  <name value="NHSDigitalReference" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <type value="Reference" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Reference" />
  <derivation value="constraint" />
  <differential>
    <element id="Reference.identifier">
      <path value="Reference.identifier" />
      <type>
        <code value="Identifier" />
        <profile value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-Identifier" />
      </type>
    </element>
  </differential>
</StructureDefinition>