Editing Tutorial

[gradea]

Does it exist? The tutorial I mean, not an urban legend, like Bigfoot, or Eurkle or something. Is there any documentation on how to edit the various files? Specificly Xml (Yes, i know you can use note pad to edit it, but it I want something that actually helps teach you WHAT to edit to get certain effects.)

[Solver]

The creation forum
Modiki
Partial XML reference