Hello,
I want a vertical space between the label and the chapter title: is this
the right way to proceed ?
Thank you.
Fabrice

\setuplabeltext[chapter=Chapitre~]

\unexpanded\def\Title#1#2{\framed[frame=off,width=fit,align=flushleft]{#1\blank#2}}

 \setuphead
  [chapter]
  [style=\bfc,
   command=\Title]

\setupenumerations
  [before={\blank},
   after={\blank},
   alternative=serried,
   title=yes,
   prefix=yes,
   prefixsegments=chapter,
   way=bychapter,
   titlestyle=bold,
   width=broad]

\defineenumeration
   [definition]
   [text=Définition,
    number=yes,
    headcommand=\groupedcommand{}{.},
    style=italic]

\starttext


  \startchapter
    [title=Nombres complexes : point de vue algébrique]

    \startdefinition
      \input zapf
    \stopdefinition
    \startdefinition
      \input zapf
    \stopdefinition

  \stopchapter

\stoptext