<Organization xmlns="http://hl7.org/fhir">
  <id value="Organization-Extension-Period-Example" />
  <!-- **************extension start************** -->
  <extension url="http://hl7.org/fhir/StructureDefinition/organization-period">
    <valuePeriod>
      <start value="2017-01-01T00:00:00.000Z" />
    </valuePeriod>
  </extension>
  <!-- *************extension end *****************-->
  <identifier>
    <use value="official" />
    <system value="https://fhir.nhs.uk/Id/ods-organization-code" />
    <value value="RR8" />
  </identifier>
  <name value="LEEDS TEACHING HOSPITALS NHS TRUST" />
</Organization>