transform each character of a string

Hi everybody, I'm (still) working on an XSLT sheet to transform MathML
into french Braille for Blind people to access it.
The numbers (1 to 0) have a Braille code corresponding to letters with
accents when they're in a mathematical context.
Examples :
1 is â
2 is ê
3 is î
and so on.

So when I have for example
<mn>132</mn>
in the source, I'd like to have
&acirc;&icirc;&ecirc;
in the HTML output.

I know there is the "translate" function, but it seems to work only for a
1 on 1 traduction....
Any help will be greatly appreciated.

Thanks
Frederic


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