Michael Guravage schrieb am 26.03.2020 um 14:29:
> Greetings,
>
> I would like to add a citation to a block quotation. Wolfgang proposed a
> solution
> <https://www.mail-archive.com/ntg-context@ntg.nl/msg55956.html>back in
> May 2011. With \star-stopquotation, the left quotation mark protrudes to
> the left of the text. With Wolfgang's solution, the quotation marks are
> aligned with the text. For consistency's sake, I need cited and
> non-cited quotations to appear alike.
>
> A lot has changed in the last nine years. Is there a newer way to
> achieve this behavior?

You can use the userdata environment to create a custom environment with
optional arguments.

\startsetups[userdata:extendedquotation]
   \startnarrow[middle=4em]
   “\getinlineuserdata”\userdataparameter{source}
   \stopnarrow
\stopsetups

\defineuserdataalternative
   [extendedquotation]
   [renderingsetup=userdata:extendedquotation]

\defineuserdata
   [extendedquotation]
   [alternative=extendedquotation,
    before=\blank,
    after=\blank]

\starttext

\input tufte

\startuserdata[extendedquotation][source=\footnote{See Tufte …}]
\input tufte
\stopuserdata

\input tufte

\stoptext

Wolfgang
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