Null return values from rpc calls

 
How are null rpc return values represented in a SOAP 1.2 response messages? Is the following response message (indicating a null return) conformant?
<soap:Envelope xmlns:soap="http://www.w3.org/2002/12/soap-envelope" xmlns:soapenc="http://www.w3.org/2002/12/soap-encoding" xmlns:tns="http://soapinterop.org/" xmlns:types="http://soapinterop.org/" xmlns:rpc="http://www.w3.org/2002/12/soap-rpc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Body>
    <types:echoStringResponse>
      <rpc:result xmlns="">return</rpc:result>
    </types:echoStringResponse>
  </soap:Body>
</soap:Envelope>

Received on Thursday, 27 February 2003 16:32:59 UTC