<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://www.w3.org/2003/05/soap-envelope">
   <SOAP-ENV:Header>
       <t:Transaction xmlns:t="urn:tx" SOAP-ENV:mustUnderstand="true">5</t:Transaction>
   </SOAP-ENV:Header>
   <SOAP-ENV:Body>
       <m:GetLastTradePrice xmlns:m="urn:trade">
           <symbol>DEF</symbol>
       </m:GetLastTradePrice>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>