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Posts: 118 | Thanked: 202 times | Joined on Aug 2010
Check my post here:

It's not "step by step", but if you have a look at my rx-51 file there you can see how it's done fairly easily.

If you are using the normal English layout have a look at the bottom section starting with
partial hidden alphanumeric_keys
xkb_symbols "english_base" {
each key is assigned four values, from left to right:
standard key, shift+key, sym+key, shift+sym+key

E.g. your beloved Tab is realized by Sym+Space; check out the third column in this line:
key <SPCE>  { [     space,          at,             Tab,            bar ]}
Hope this helps.