COBOL, Oracle & XML

Does anyone have any sample code they could point me to that
demonstrates how to use the XML features of Oracle within COBOL?

I would like to select data from our database into an XML format that
will then be passed to a remote process. I would also like to take the
response from that process (again in XML format) and insert it back
into my database.

I was thinking that using Oracle's built in XML processing
(XML_SYSGEN, etc) would be the best way to accomplish this, but I
cannot find any "practical" examples of how you would accomplish this.

Here's the pertinent info:

OS - HP-UX 11i
Oracle - 9i (9.2.0.4.0)
Cobol - MF OC 4.2 or MF Server Express 2.2 (both available)

Thanks in advance for any input!

Chris