options available to SoapClient constructor

Hello everybody! I am writing a client that has to send "not valid" XML messages to the server for testing purposes. My problem is, that SoapClient in wsdl-mode checks the validity of the message before sending and *exits* (i.e. it is not possible to catch the exception) if the message is not valid. Are there any options available to the constructor of SoapClient to disable validating the message? I can't find any usefull information under http://www.php.net/manual/en/function.soap-soapclient-construct.php Maybe someone can point me to the right direction/documentation. Thanks in advance for your help. Best regards, Pablo -- Pablo Javier Roca Méndez