Hi,
I have simplified the code, but I get :

Remark I.1.
Remark I.2.
Remark I.3.

instead :

Remark 1.1.

Remark 1.2

Remark 1.3

Thanks

Fabrice

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\definestructureconversionset
[structure]
[numbers, Romannumerals, numbers, numbers, numbers]
[numbers]

\setupheads [sectionconversionset=structure]

\defineenumeration
[remark]
[
    text=Remark,
    location=serried,
    width=fit,
    right={.~},
    prefix=yes,
    prefixsegments=chapter,
]

\setupnumber[remark][way=bychapter]

\starttext
\startchapter
[title={First chapter}]
\startsection
[title={First section}]
\dorecurse{3}{\startremark \input ward \stopremark}
\stopsection
\stopchapter
\stoptext
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

2017-08-24 14:53 GMT+02:00 Fabrice Couvreur <fabrice1.couvreur@gmail.com>:

Hello,
I would like to have this :

####################

Chapitre I : Espaces probabilisés

I.1 - Expérience aléatoire et univers

Définition 1.1

Définition 1.2

####################

Thank you
Fabrice

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\definestructureconversionset
[structure]
[numbers, Romannumerals, numbers, numbers, numbers]
[numbers]

\setupheads [sectionconversionset=structure]

\setupenumerations
[
before={\blank[big]},
after={\blank[big]},
alternative=serried,
width=broad,
distance=0.5em,
headstyle=bold,
titlestyle=bold,
prefix=chapter,
way=bychapter,
conversion=numbers]

\defineenumeration
[definition]
[
text=Définition,
title=yes,
style=italic,
list=all,
listtext={Définition}]

\starttext
\startchapter[title=Espaces probabilisés]
\startsection[title=Expérience aléatoire et univers]
\startdefinition
On appelle expérience aléatoire une expérience sur un système dont le résultat n'est pas connu d'avance et peut varier si on répète cette expérience.
\stopdefinition
\startdefinition
On appelle univers l'ensemble des résultats possibles. Il est noté \math{\Omega}.
\stopdefinition
\stopchapter
\stoptext

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%