I'm willing to fix those AppStream files, but first I need to
know how... :-/
Did you look at, e.g.,
https://github.com/hughsie/createrepo_as_logs/blob/master/u/urw-base35-bo...
It appears you're missing a </p> tag.
You can get this info locally by running `appstream-util validate` on the XML files.
--
Peter Oliver