IDoc to XML without a XI server

We are trying to send material information to a third party software.  The method they want to use is to create an IDoc that will output a XML file that can be FTP'd to a location where the third party software can pick it up.  To setup the IDoc to XML portion, is a XI server required?  If not, can anyone give me instructions on doing this, or at least point me in the right direction?

Thanks,

Curtis