<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:test="http://test.webservices.its.ws">
   <soap:Header/>
   <soap:Body>
      <test:echoString>
         <!--Optional:-->
         <test:str> ddd</test:str>
      </test:echoString>
   </soap:Body>
</soap:Envelope>

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:test="http://test.webservices.its.ws">
   <soapenv:Header/>
   <soapenv:Body>
      <test:echoString>
         <!--Optional:-->
         <test:str> baba </test:str>
      </test:echoString>
   </soapenv:Body>
</soapenv:Envelope>