membershipReplaceAttributes

<soapenv:Envelope 
    xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" 
    xmlns:ecm="http://ecircle.com/developer/ecmapi">
  <soapenv:Header/>
  <soapenv:Body>
     <ecm:membershipReplaceAttributes>
        <userId>5</userId>
        <groupId>1</groupId>
        <!--Zero or more repetitions:-->
        <attributes>
           <name>likesfootball</name>
           <value>yes</value>
        </attributes>
     </ecm:membershipReplaceAttributes>
  </soapenv:Body>
</soapenv:Envelope>