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Could anyone provide a example on how to use PHP-SOAP to submit a raw xml file?
That doesn't make sense. PHP's SOAP client initializes the methods based on the wsdl file.
I'm 99% sure that that's not what you want but take a look at http://php.net/manual/en/soapvar.soapvar.php and force it to use XSD_ANYXML as encoding type to generate the soap var from an xml string.