Dear fellow Processing Programmers,

I have a project that is way over my head.  I was wondering if anyone could help.

I have successfully ran Ben Fry's program from the Visualizing Data book on his Treemap of a specific file structure and which one takes up the most space.  I want to do a similar program using an XML file.

This file is made up of Knowledge Areas, containg Units, containg Topics, containing Objectives.  (all of course have their own attributes as well) I would like to zoom in and out of these structures.  However, I don't even know the first place to start in integrating the previous program from the book with my file.  

If anyone has done anything similar to what I am asking, or could point me in the right direction, I would really appreciate all the help I can get.  I would also really appreciate if a dialogue could be struck-up via email, so just let me know if any of you good programmers would help newbie in need.

Thank you to all who reply.