Invoking PDF conversion over WSDL

Hi,

for some reason, I need to use in one process webservice invokation for PDF generation (as the PDF generation service is on different server)

And my knowledge of SOAP envelopes is minimal. I can not figure out how to pass the document type variable to the webservice and to obtain converted document to PDF as document variable type again.

Any hints would be highly appreciated and if you manage to post SOAP request with the process variable that refers to the input document, that would be awsome.

Thanks and sorry for bothering

J