xkbd and alt-modifier key-codes.

Hello,

I was wondering, with xkbd, how do I make alt-2 give '~' for example?
I'm building a french keyboard layout and there are a few
alt-combination
keycodes that I need to add.
Alt-2 gives '~'
Alt-3 gives '#'
Alt-4 gives '{'
Alt-5 gives '['
... etc.

(yeah, it's a weird layout IMO too :)

Cheers,

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