Answering my own question… this fits my needs:
###
\defineconversion[romannumeralszero][0, I, II, III, IV, V, VI, VII,
VIII, IX, X, XI, XII, XIII, XIV, XV, XVI, XVII, XIII, XIX, XX, XXI]
\setuphead[section][conversion=romannumeralszero]
\starttext
\startsection[title={Section zero}]foo\stopsection
\startsection[title={Section 1}]bar\stopsection
\stoptext
###
Sorry for the noise
Le 16/02/23 à 17:32, Alex Leray via ntg-context a écrit :
Hello,
I'd like to have roman numerals prefixed sections, but starting from
Zero and not One (even if I know that roman numerals don't have a sign
for 0).
Is there a way to achieve this? My code looks like that at the moment:
###
\setuphead[section][conversion=Romannumerals]
\starttext
\setupheadnumber[section] [-1]
\startsection[title={Section zero}]\stopsection
\startsection[title={Section one}]\stopsection
\stoptext
###
Thank you,
Alex
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