Need to send multiple parameters with the same name

I'm trying to send multiple parameters with the same name but NuSoap only  
sends the last one mentioned.

--code--

$requestparams = array ('Group' => array ('Name' => 'Medium'), 'Group' =>  
array ('Name' => 'Request'));

$result = $client->call('DoSomething', $requestparams, 'xmlns');

How can I set the parameters so it sends both lots of 'Group' and not just  
the last one?

thanks for any help,

Paul



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