On Fri, 23 Nov 2012 20:23:44 +0100, Aditya Mahajan <adityam@cim.mcgill.ca> wrote:

>> ... I probably found it (how easy!):
>>
>> ----
>> \definestartstop
>> [Rek]
>> [before={\blank\setupnarrower[left=\parindent,right=\parindent]\startnarrower},
>>  after={\stopnarrower\blank},
>>  style=\em,
>> ]
>> ----
>
> (Untested, as I don't know if narrower accepts indent and style keys; if
> not this should serve as a feature request :))
>
> \definenarrower
>      [Rek]
>      [left=\parindent,
>      right=\parindent,
>      indenting=next,
>      after={\blank},
>      style=em]
>
>
> Aditya

Thanks Aditya,

it works excluding the "style" key, so the font change must be performed in the "before" scope:

----
\definenarrower
   [Rek]
   [left=\parindent,
    right=\parindent,
    indenting=next,
    before=\blank\bf,
    after=\blank,
    style=em,
   ]

\starttext
   \input tufte
   \startRek
     \input knuth
   \stopRek
   \input tufte
\stoptext
----

Best regards,

Lukas