<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://fhir.synapxe.sg/StructureDefinition/profile-identifier" />
  <name value="Identifier" />
  <status value="active" />
  <fhirVersion value="5.0.0" />
  <kind value="complex-type" />
  <abstract value="false" />
  <type value="Identifier" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Identifier" />
  <derivation value="constraint" />
  <differential>
    <element id="Identifier.id">
      <path value="Identifier.id" />
      <max value="0" />
    </element>
    <element id="Identifier.extension">
      <path value="Identifier.extension" />
      <max value="0" />
    </element>
    <element id="Identifier.use">
      <path value="Identifier.use" />
      <max value="0" />
    </element>
    <element id="Identifier.type">
      <path value="Identifier.type" />
      <max value="0" />
    </element>
    <element id="Identifier.system">
      <path value="Identifier.system" />
      <min value="1" />
    </element>
    <element id="Identifier.value">
      <path value="Identifier.value" />
      <min value="1" />
    </element>
    <element id="Identifier.period">
      <path value="Identifier.period" />
      <max value="0" />
    </element>
    <element id="Identifier.assigner">
      <path value="Identifier.assigner" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>