fonts.dtd does not include new fonts.conf elements, fonts.conf does not validate
This bug on the old bugzilla was closed and is still a problem https://bugs.freedesktop.org/show_bug.cgi?id=105818
Since 9a0fcb94 the fonts.conf, and other conf files in conf.d, have failed to validate per fonts.dtd
Note that https://gitlab.freedesktop.org/fontconfig/fontconfig/-/blob/master/fonts.dtd does not describe or allow the
description elements found in https://gitlab.freedesktop.org/fontconfig/fontconfig/-/blob/master/fonts.conf.in
Previous comments in bugzilla suggest this is a packaging and localization problem, however I think the existence and non-validation of the
description element says otherwise.