[NTG-context] use of preceding-sibling in xmlsetsetup

[massifr at fastwebnet.it]

I've found a better solution:

\startxmlsetups xml:p
  \doif{\xmlattribute{#1}{reverse-sibling::p[1]}{class}}{incipit}{\noindent}%
  \xmlflush{#1}\par
\stopxmlsetups

Still I did not manage to put that rule in a xmlsetsetup.
Tried this:

\xmlsetsetup{#1}{p[reverse-sibling::p[1]/attribute('class') == 'incipit']}{xml:p:noindent}

but it does not work.

> Hello list,
> I need a lpath expression to intercept the first p (HTML paragraph) 
> after a p of class "incipit". Here's a (not) working example:
> 
> \startbuffer[test]
> <text>
>   <p class="incipit">Dear list,</p>
>   <p>this paragraph should not be indented, because it follows the “incipit”
>   of the letter.</p>
>   <p>This one and the following ones should be indented.</p>
>   <p>You may question whether “Dear list,” should be a paragraph of his own,
>   but my text is already formatted like that and I can’t do anything 
>   about it.</p>
> </text>
> \stopbuffer
> 
> \startxmlsetups xml:somesetups
>   \xmlsetsetup{#1}{text}{xml:text}
>   \xmlsetsetup{#1}{p}{xml:p}
>   \xmlsetsetup{#1}{p[@class='incipit']}{xml:p:noindent}
>   % the following lpath expression does not work
>   \xmlsetsetup{#1}{p[./preceding-sibling::[-1][@class = 'incipit']]}{xml:p:noindent}
> \stopxmlsetups
> 
> \xmlregistersetup{xml:somesetups}
> 
> \startxmlsetups xml:text
>   \indenting[{yes,first,12pt}]
>   \xmlflush{#1}
> \stopxmlsetups
> 
> \startxmlsetups xml:p
>   \xmlflush{#1}\par
> \stopxmlsetups
> 
> \startxmlsetups xml:p:noindent
>   \noindent\xmlflush{#1}\par
> \stopxmlsetups
> 
> \starttext
>   \xmlprocessbuffer{main}{test}{}
> \stoptext
> 
> Thanks for any help.