The topic about manuals is locked, so I had to ask (to suggest) following in a separate one.
I don't know anything about xml, but I'm trying to make a skin, so I use
PVD Skin Engine Manual a lot. It's a resource of a great help, indeed. Especially for us newbies.
What I found it might be helpful was to indicate default values, so it would be easier to decide whether or not to implement particular functions. Xml file also would be of a smaller size, without unnecessary (duplicated) data.
I apologize if I didn't understand that there weren't default values, and that it wasn't the way how things work.