Am 05.11.2013 um 13:22 schrieb Procházka Lukáš Ing. - Pontex s. r. o. 
<l...@pontex.cz>:

> Hello,
> 
> I noticed now that:
> 
> ----
> \starttext
>  \startsection[ownnumber=0,title=A]
>    bla
>  \stopsection
> 
>  \startsection[title=B]
>    bla
>  \stopsection
> \stoptext
> ----
> 
> gives:
> 
> "
> 0 A
> 
> bla
> 
> 2 B   <- 1 should be here instead of 2; automatically
> 
> bla
> "
> 
> instead of:
> 
> "
> 0 A
> 
> bla
> 
> 1 B
> 
> bla
> "
> 
> So my original question remains:
> 
> How to start counting sections (locally) from 0, not from 1?

\defineexpandable[1]\PreviousNumber{\number\numexpr#1-1\relax}

\defineconversion[PreviousNumber][\PreviousNumber]

\setuphead[section][conversion=PreviousNumber]

\starttext

\startsection[title=A]
bla
\stopsection

\startsection[title=B]
bla
\stopsection

\stoptext

Wolfgang
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