Chemical Markup Language
Discord
Konrad, are you familiar with Chemical Markup Language (CML)? I stumbled across it on Twitter a few weeks ago via discussions about open publishing, and was surprised at the longevity of the project. I don’t love XML, but it seems to have gained some traction in its day, though I am not sure how active it is these days. https://en.m.wikipedia.org/wiki/Chemical_Markup_Language