Description:
------------
I try to access a not-PHP web service (SOAP, WSDL available) using ext/soap.
But my parameters aren't put correctly in the xml request. What am I doing wrong?

The PHP documentation is not complete at this point, so it's undocumentated.

My question: What's the general syntax for nestled parameters (or: how must the following $parameters be built?). 

Best Regards,
Moritz Augustin
Core Networks GmbH - http://www.core-networks.de

Reproduce code:
---------------
Relevant content of WSDL (some parts are replaced by an asterisk): http://dev.unitedservers.de/moritz/wsdl

// the constructor array argument just sets the real class variables
$client = new SoapClient(*****, array ("trace" => 1, "classmap" => array (
	"GetModifiedOrdersInput"	=> "GetModifiedOrdersInput",
	"QueryRequestHeader"		=> "QueryRequestHeader",
	"orderQueryOptions"			=> "orderQueryOptions"
)));

$parameters = new GetModifiedOrdersInput (array (
		"QueryRequestHeader"	=> new QueryRequestHeader (array (
			"PartnerCode"			=> "XXXXXXXXX",
			"ReplayToken"			=> "aaaaaaaaaa8sdmf23n4asdkjHAsd8123"
		)),
		"FromDate"				=> time () - 3600 * 24 * 30,
		"ToDate"				=> time (),
		"orderQueryOptions"		=> new orderQueryOptions (array (
		
		))
	));

try {
$client->GetModifiedOrders ($parameters); }
catch (SoapFault $f) {
echo $f->faultstring; echo $f->faultcode; }

echo htmlspecialchars ($client->__getLastRequest ());

Expected result:
----------------
No errors.
A xml file with the contents of $parameters.

Actual result:
--------------
An error message without useful information:
        null
      fc:JWSError

And the xml file without any useful data:
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://api.geotrust.com/webtrust/query"><SOAP-ENV:Body><ns1:GetModifiedOrders/></SOAP-ENV:Body></SOAP-ENV:Envelope>