[xsl] Add namespaces to a soap xml output

Hi to all
I'm new, and i have  a problem:
I  need to add one namespaces to all node and remove all tag that not 
contains any data from a soap envolpe request :
this is my input xml:

<soapenv:Envelope 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:xsd="http://www.w3.org/2001/XMLSchema"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
  <soapenv:Body>
     <RICHIESTA_INFORMAZIONI_ASSISTITO DataOra="200603072355" 
idCup="150103" idOperatore="df" xmlns="some.url">
        <ASSISTITO>
           <Citta/>
           <CodFiscale>CRDLCN73L04F839J</CodFiscale>
           <CodPostale/>
           <CodSanitario/>
           <Cognome/>
           <DataNascita/>
           <Domicilio/>
           <Email/>
           <Indirizzo/>
           <Nome/>
           <Provincia/>
           <Sesso></Sesso>
           <Stato/>
           <Telefono/>
           <e-mail/>
           <idImpegnativa/>
           <Urgenza/>
        </ASSISTITO>
     </RICHIESTA_INFORMAZIONI_ASSISTITO>
  </soapenv:Body>
</soapenv:Envelope>

and this is the output that i want:

<soapenv:Envelope 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:xsd="http://www.w3.org/2001/XMLSchema"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
  <soapenv:Body>
     <cup:RICHIESTA_INFORMAZIONI_ASSISTITO DataOra="10102005" idCUP="1" 
idOperatore="DAVIDE" xmlns="some.url" xmlns:cup="some.url">
        <cup:ASSISTITO>
           <cup:CodFiscale>TRNCMN78S24F839Y</cup:CodFiscale>
          
        </cup:ASSISTITO>
     </cup:RICHIESTA_INFORMAZIONI_ASSISTITO>
  </soapenv:Body>
</soapenv:Envelope>

How for do this?
Many Thanks.


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