> Michael Eidenbenz <mailto:eidenbenz@arch.ethz.ch>
> 26. Oktober 2016 um 23:03
> Dear Wolfgang,
>
> thanks for your mail, that led me to the source in syst-aux where I 
> found the TeX approach, my final solution.
>
> \def\startCitation%
>   { \startnarrower[left,right]
>     \symbol[leftquotation]
>     \removeunwantedspaces}

\unexpanded\def\startCitation
   {\startnarrower[left,right]
    \symbol[leftquotation]%
    \ignorespaces}

> \def\stopCitation#1\par%
>   { \removeunwantedspaces
>     \symbol[rightquotation]
>     #1
>     \stopnarrower}

\unexpanded\def\stopCitation#1\par
   {\removeunwantedspaces
    \symbol[rightquotation]%
    #1%
    \stopnarrower}

Wolfgang