I'm thinking this could be part of the base class, so that that all export plugins benefit, but if that is difficult then just the XML plugin needs it:

The basic idea is to build a way to pump gradebook data out via http like a very simple web service.

So imagine some settings addded to the initial screen to:

Publish these grades via URL: [X]

Limit client IPs to: |__192.168.2.2, 135.6.78.99 _______________| (highly recommended)

Require password: |_snoopy123__|

If this checkbox is on, then the data is not sent to the screen and downloaded as a file like usual, instead you see a page which gives you the URL to access this data in a simple way, eg something like:

http://test.moodle.com/grade/export/xml/dump.php?courseid=3&items=4,5,6,7,8,10&password=snoopy123

which can be cut and pasted elsewhere.