\setupmargindata[outerhead][align=center,width=\rightmarginwidth]26. März 2017 um 22:09 via Postbox
Many thanks for the implementation, Hans.
I’m afraid that I found an issue. Alignment in margindata doesn’t work:
\showframe
\definemargindata[outerhead][outer]
\setupmargindata[outerhead][align=center]