question re: Shane's sample DIME code

In Shane's doco at talks.php.net he has sample code as: $v = new SOAP_Attachment('test','text/plain',$filename); $methodValue = new SOAP_Value('testattach', 'Struct', array($v)); $client = new SOAP_Client( 'http://www.caraveo.com/soap_interop/server_round2.php'); $resp = $client->call('echoMimeAttachment',array($v), array('namespace'=>'http://soapinterop.org/')); Can anyone explain what the use of creating the $methodValue variable is? It isn't used in the call. Does it have a side-effect that is used? Is it just a left-over from an earlier version of the code? Brodie.