> Michael Eidenbenz <mailto:eidenbenz@arch.ethz.ch>
> 26. Oktober 2016 um 16:30
> after some readings in the TeX book I came up with the following 
> solution that works for me without having to change all my instances 
> of startstopCitation in the text.
This doesn’t work when you have more than one paragraph in the Citation 
environment.
> \definestartstop
> [Citation]
> [
> before={\hangindent=20mm\hangafter=0\symbol[leftquotation]},
> after={\removeunwantedspaces\symbol[rightquotation]},
> ]
>
> \starttext
> \startCitation
> \input tufte
> \stopCitation
> \footnote{This is a Quote of Donald Knuth}
>
> \input tufte
> \stoptext
Here is a alternative version but you need a empty line or \par after 
\stopCitation.

\define\startCitation
   {\startnarrower[left]
    \symbol[leftquotation]\ignorespaces}

\define\stopCitation
   {\BeforePar{\removeunwantedspaces\symbol[rightquotation]}%
    \AfterPar {\endgraf\stopnarrower}%
    \GetPar}

\starttext

\startCitation
   \input knuth
\stopCitation
\footnote{This is a Quote of Donald Knuth}

\input knuth

\stoptext

Wolfgang