trax,

I don't know the exact answer to your question, but what I do know is that the OzTiVo community uses:

http://minnie.tuhs.org/twiki/bin/view/Guidedata/WebHome

and a program called the StationDayEditor to make up the TV Guide data and upload it. If you click the link above, you will be taken there and you can view information about it.

Does anyone more knowledgeable than me want to field this question?