Just to understand a bit more : signs like equal are printed inside math
environment with GFS Didot thanks to \definetypeface[myface][rm][Xserif][GFS
Didot]. Since GFS Didot ,as a greek font has greek letters, why are these
glyphs not used ? I suppose that when greek people are using directly alpha
as a letter (not \alpha), it should take into account the GFS Didot font,
shouldn' it ?


>
> No time for complete answer, but you need to define the whole
> [math][GFS Didot] repertoaire first. This has no effect until you
> define one.
>
> Someone needs to write "Unicode math support" for mkii, or you need to
> make your own virtual font.
>
> See this file for example:
>    http://source.contextgarden.net/math-lbr.tex
> in a similar way that would need to be done for general typefaces without
> math.
>
> You might then be able to say something like
>    \definetypeface[myface][mm][Xmath][GFS Didot], though I'm 100%
> sure that people would then start complaining very soon that they
> either:
> - want other math characters in their favorite font as well (like
> plus, minus, brackets, ...), not only Greek letters
> - complain that they don't get any symbol (no font has them all)
>
> Mojca
>
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-- 
Flavien.
----------------------------
"Quantum objects are completely crazy but, at least, they are all crazy in
the same way." R.P. Feynman.