customizing keyboard layout with XKB

[Alan James Caruana]

Hi,

I've been searching on how to configure and customize a keyboard
layout with XKB, and all I could find is the basic guide on the
XFree86 site. ( www.xfree86.org/current/XKB-Config.html ), but I need
something more detailed (or maybe some help from anybody who knows
XKB).

There is the "XkbOptions" field, but I couldn't find a list of the
possible options I can give it. The same goes for "XkbVariants".

I know that I can use the "XkbLayout" to change the keyboard language,
but if I want to create a custom keyboard layout, say with the letters
'Q' and 'A' inverted, what should I do?

I would appreciate it if anyone could help me in any way, whether by
giving me the solution or by pointing me towards good documentation
from which I can figure out how to do it myself.

Regards
Alan Caruana