Property transfert: problem with namespace used in xsi:type

Hi

I try to transfert a node ('toTransfert') from a response to a request.

Here is the Response:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"  xmlns:ns1="http://ns1">
   <soapenv:Header/>
   <soapenv:Body>
      <ns1:Response>
   <toTransfert xsi:type="ns2:myType" xmlns:ns2="http://ns2">
        .....
   </toTransfert>
      </ns1:Response>
   </soapenv:Body>
</soapenv:Envelope>

and here is the Request:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://ns1">
   <soapenv:Header/>
   <soapenv:Body>
      <ns1:Request>
   <toTransfert>
          <!--Zero or more repetitions:-->
                                ...
   </toTransfert>
      </ns1:Request>
   </soapenv:Body>
</soapenv:Envelope>

I use these xpaths:

--> Source: (with declared namespaces)

/soap:Envelope[1]/soap:Body[1]/ns1:Response/toTransfert

--> Target: (with declared namespaces)

/soap:Envelope[1]/soap:Body[1]/ns1:Request/toTransfert

My problem is that this method doesn't transfert the definition of the namespace used in xsi:type (xmlns:ns2="http://ns2"):

The obtained Request is:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://ns1">
   <soapenv:Header/>
   <soapenv:Body>
      <ns1:Request>
   <toTransfert xsi:type="ns2:myType"> <!-- xmlns:ns2="http://ns2" is missing here-->
   .....
   </toTransfert>
      </ns1:Request>
   </soapenv:Body>
</soapenv:Envelope>

How can I do to transfert this namespace declaration?

Thanks in advance!!!