<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://fhir.synapxe.sg/StructureDefinition/profile-reference-practitioner" />
  <name value="Reference" />
  <status value="active" />
  <fhirVersion value="5.0.0" />
  <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.id">
      <path value="Reference.id" />
      <max value="0" />
    </element>
    <element id="Reference.extension">
      <path value="Reference.extension" />
      <max value="0" />
    </element>
    <element id="Reference.reference">
      <path value="Reference.reference" />
      <max value="0" />
    </element>
    <element id="Reference.type">
      <path value="Reference.type" />
      <min value="1" />
      <fixedUri value="Practitioner" />
    </element>
    <element id="Reference.identifier">
      <path value="Reference.identifier" />
      <min value="1" />
      <type>
        <code value="Identifier" />
        <profile value="https://fhir.synapxe.sg/StructureDefinition/profile-identifier" />
      </type>
    </element>
    <element id="Reference.identifier.system">
      <path value="Reference.identifier.system" />
      <valueAlternatives value="https://fhir.synapxe.sg/NamingSystem/mcr" />
      <valueAlternatives value="https://fhir.synapxe.sg/NamingSystem/snb" />
      <valueAlternatives value="https://fhir.synapxe.sg/NamingSystem/prn" />
      <valueAlternatives value="https://fhir.synapxe.sg/NamingSystem/dcr" />
    </element>
  </differential>
</StructureDefinition>