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my $soap = SOAP::Lite->new->proxy('https://wsnet.sendwordnow.com/Sessi
+onManagement/2010/05/PublicSessionManagementService.svc')
    ->ns('http://schemas.xmlsoap.org/soap/envelope/', 'soapenv')
...
my $reqm = SOAP::Data->name( RequestOf_PublicLoginRequest => $oper )->
+prefix('pub');

my $res = $soap->call( $reqm );

<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope 
...
    <RequestOf_PublicLoginReqest xsi:nil="true" />   #### EMPTY!!! ###
+#
</soapenv:Body>
</soapenv:Envelope>