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<?xml version = "1.0" encoding = "UTF-8" ?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envel
+ope/" 
...
    </multiRef>
  </soapenv:Body>
</soapenv:Envelope>

my %methods = (
getNewGroup => {
...
      SOAP::Data->new(name => 'in1', type => 'tns1:NewGroupKey', attr 
+=> {}),
    ], # end parameters
  }, # end getNewGroup

use SOAP::Lite +trace => 'debug';
use Data::Dumper;
...
$obj->readable(1);
$obj->want_som(1);
$obj->getNewGroup($headers,15,16789900);

  <soap:Body>
    <impl:getNewGroup>
      <in0 xsi:nil="true" xsi:type="tns1:PartKey" />
          </impl:getNewGroup>
  </soap:Body>