Adding namespace identifier to Doc/Lit request

You created this request in a Doc/Lit sample:

<SOAP-ENV:Envelope 
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:xsd="http://www.w3.org/2001/XMLSchema"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"; 
xmlns:si="http://soapinterop.org/xsd"; xmlns:nu="http://testuri.org";>
<SOAP-ENV:Body>
<hello xmlns="urn:hellowsdl3">
<name><firstname>Willi</firstname><age>22</age><gender>male</gender></name>
</hello>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

How can I make the same Doc/Lit request but have a namespace identifier 
prefixed to the elements? So, I want my request to look like this:

<SOAP-ENV:Envelope 
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:xsd="http://www.w3.org/2001/XMLSchema"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"; 
xmlns:si="http://soapinterop.org/xsd"; xmlns:nu="http://testuri.org";>
<SOAP-ENV:Body>
<fred:hello xmlns:fred="http://www.fredslink.zzz/mynsidenthere";>
<fred:name><fred:firstname>Willi</fred:firstname><fred:age>22</fred:age><fred:gender>male</fred:gender></fred:name>
</fred:hello>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

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