Thanks, that’s what I was thinking but I’m missing something. If I replace  the double white line in knuth.tex with \crlf
indentation is not applied anymore to the first block.

In my source I have this:

%%%% TYPESET with Mark IV %%%

\enableregime[utf]
\mainlanguage[it] 
\language[it]
\setupcolors[state=start]
\definepapersize[ZaffiriBook][width=130mm,height=205mm]
\setuppapersize[ZaffiriBook, portrait][ZaffiriBook, portrait]
\setuppagenumber[state=stop]
\setuppagenumbering[location={footer, margin}]

\setupindenting[yes, medium]
\setupheads[indentnext=yes]

\setuptyping
   [before={\setupbodyfont[6pt]},
    after={\setupbodyfont[9pt]}]

\usetypescript[palatino]
\setupbodyfont[palatino,9pt]

\setupfootnotes[way=bysection, numberconversion=romannumerals]

\defineparagraphs
     [mypar][n=3,before={\blank},after={\blank}]
 \setupparagraphs
     [mypar][1][width=.3\textwidth,style=bold]
  \setupparagraphs
     [mypar][2][width=.4\textwidth]

\starttext


%% various chapter inputs follow

I get the indent only in the first line of each section/subsection

Best
-a-


--------------------------------------------------
Andrea Valle
--------------------------------------------------
CIRMA - StudiUm
Università degli Studi di Torino
--> http://www.cirma.unito.it/andrea/
--> http://www.fonurgia.unito.it/andrea/
--> http://www.flickr.com/photos/vanderaalle/sets/
--> http://vimeo.com/vanderaalle
--> andrea.valle@unito.it
--------------------------------------------------

"This is a very complicated case, Maude. You know, a lotta ins, a lotta outs, a lotta what-have-yous." 
(Jeffrey 'The Dude' Lebowski)

On 13 Oct 2014, at 23:48, Wolfgang Schuster <schuster.wolfgang@gmail.com> wrote:

> 
> Am 13.10.2014 um 23:42 schrieb Andrea Valle <valle@di.unito.it>:
> 
>> thanks Wolfgang,
>> see the “indent” section here:
>> http://smad.jmu.edu/shen/webtype/indent.html
> 
> \setupindenting[yes,medium]
> 
> \starttext
> 
> \input knuth
> 
> \section{Knuth}
> 
> \input knuth
> 
> \stoptext
> 
> Wolfgang
> 
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