Gradebook Database Schema - Table Names

Hi all,

I'm new to Moodle. I was just wondering what the tables in the Gradebook database schema store and represent? For me some of the tbl names aren't meaningful to explain what's being stored. Also the some of the field names are throwing me off too :-S.

If anyone could help or direct me to a webpage that would be great.

Thanks .

DB Schema: http://docs.moodle.org/dev/images_dev/e/e0/Gradebook_erd.png