(2019-09-25, 19:13)Roland Melkert Wrote: Not during viewing.
But most editors have a list of submodels somewhere.
Navigating to them will present an empty model which you can then 'mess up' if not careful.
And doing so would break the mpd for software which does understand the new meta.
I don't understand your final point, but I'll bow to your superior wisdom with respect to editors. (Note, since it's often not obvious in posts, I am not being sarcastic.) Please write up a proposal (like mine above) for your proposed version of !DATA, and we can discuss it, and then vote on it.