> Fabrice Couvreur <mailto:fabrice1.couvreur@gmail.com>
> 13. Juli 2016 um 17:09
> Hello,
> I wish that in the table of contents and only one, the number of 
> chapters are I, II, III, IV ...
When you change a different conversion for the chapter numbers only in 
the ToC use this:

\defineconversionset[chapterconversion][n,R][n]

     \setuplist
         [chapter]
         [numberconversionset=chapterconversion]

but when you want it in the entire document use this:

\defineconversionset[chapterconversion][n,R][n]

     \setuphead
         [chapter]
         [sectionconversionset=chapterconversion]

Wolfgang