Comment 6 for bug 575978

The SVG image is helpful, though we need a bit more to make into changes that will get committed quickly.
The SVG image was created my users without citing some sources. I believe that some intensive googling should reveal an official document on the layout.

If you see http://cgit.freedesktop.org/xkeyboard-config/tree/symbols/is
there are two e-mails of people who helped with the initial layout. The date of the basic layout is at least 2004, perhaps older.
If you can find either of these two people to give input, it would help tremendously.