Michael Eidenbenz
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