Duncan Hothersall schrieb am 08.07.2019 um 16:45:
> The command \setupMMLappearance[mtable][alternative=b] used to give
> me, in mkii, MathML layouts in which the first column was ragged left,
> the second column centred, and the third column ragged right. It now
> seems to be ignored, and the output has all three columns centred.
Use the columnalign attribute:
http://www.pragma-ade.nl/general/manuals/mmlprime.pdf#page=33

Wolfgang