Yeah, I had a look at it, and tried it out. While it works perfectly for what it is, it gives you nothing about the actual functionality of the XML.
I tried to change the text attribute for example, and I couldnt see it made any difference at all, so why is it there? What does it do?
Changing the string in lua does change it however, so why even bother with the XML attribute?
I still haven't the first clue about how to create a dropdown with a selection of the effects possible for example.
Is the XML interface similar enough to WoW to go through the wowwiki for example and learn from there?
Thanks for the reply anyway. 
I just noticed the GUI section on the wiki. Somehow that one has evaded my eyes so far, but it is basically what I was asking for. A more detailed instruction on the XML functions.
Is it a new section? If not, then I must apologize profusely for making an unnecessary post here.
Thanks for the help nonetheless.