If you look at one of the smaller xml files that eq2 has it is pretty simple to decipher what pieces are what. Then you can try changing some values or adding things based on theories on what can be done.
You can learn a ton of stuff about what you can do just by browsing the xml files provided to you. After you get a hang of it, feel free to ask a bit more advance questions and you will more than likely get a very decriptive answer.
Good luck!
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