In order to create my own system of group letter with xindy, I am looking to the default files. For examples the files xindy/modules/lang/french/utf8.xdy.
But ... I am not able to know which is the encoding used, and so, which are the letters group defined ...
lesscan't display all of the characters, but most of it is readable. (Maybe the crucial characters are not - I didn't look closely.) – cfr Oct 15 '15 at 21:35make-rules.pland see what it does. (It is frustrating that the source of generated files is often missing.) – cfr Oct 15 '15 at 21:59