<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:sear="http://search.ws.terminologie.fhdo.de/">
   <soapenv:Header/>
   <soapenv:Body>
      <sear:ReturnConceptValueSetMembership>
         <!--Optional:-->
         <parameter>
            <!--Optional:-->
            <codeSystemEntityVersion>
              <versionId>27880</versionId>
            </codeSystemEntityVersion>
            <valueSetVersion>
              <versionId>3</versionId>
            </valueSetVersion>
         </parameter>
      </sear:ReturnConceptValueSetMembership>
   </soapenv:Body>
</soapenv:Envelope>