Hi,
I have some educational videos that I would like to structure in a way shown below. I want each video (title) to be individually accessible title and yet, when the disc is inserted, I want the user to first see "higher level" menu. That is, the menu should have links for Introduction, Mathematics, Science and History.

Can you please give me a couple of hints on how to accomplish this with the XML configuration file for dvdauthor ?

Root
|
|___ Introduction
|    |
|    |__ 1. About
|
|___ Mathematics
|    |
|    |__ 2. Introduction to Algebra
|    |__ 3. Introduction to Trigonometry
|
|___ Science
|    |
|    |__ 4. Introduction to Magnetism
|    |__ 5. Introduction to Inorganic Chemistry
|    |__ 5. Single-celled organisms
|
|___ History
     |
     |__ 7. Ancient India
     |__ 8. Medieval India
     |__ 9. Modern India