Pass XMLNode to web service method

Hi everybody, can anyone tell me how to pass an XMLNode to a web service method? While using structs as response of the web service all works fine, but there's a certain difficulty with XML data. The service is a .NET web service, I tried to find some documentation but there's no solution, also here: http://www.php.net/manual/en/ref.soap.php I couldn't find the answer. I use PHP 5 built in SOAP functions to consume the web service. Does anyone face the same problem? Thanx a lot interpeo