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Created attachment 1561673 [details]
custom validation script

Description of problem:
Based on the discussion with cgarnch. the file org.gnome.baobab.gschema.xml, 
located in /usr/share/glib-2.0/schemas should be valid against this DTD schema:

https://gitlab.gnome.org/GNOME/glib/blob/master/gio/gschema.dtd

which is not a case.

Version-Release number of selected component (if applicable):
baobab-3.28.0-1.el8.x86_64

How reproducible:
always

Actual results:
Around 500 errors: 
.
.
.
/org.gnome.baobab.gschema.xml:581:0:ERROR:VALID:DTD_UNKNOWN_ATTRIBUTE: No declaration for attribute lang of element description

Expected results:
There should be no errors

Additional info:
I am attaching script in python3 I used for validation.

The following commit should fix this:
https://gitlab.gnome.org/GNOME/baobab/commit/80f7e1c144103d52a877f2d42db6a427867591f6

(In reply to Ondrej Holy from comment #1)
> The following commit should fix this:
> https://gitlab.gnome.org/GNOME/baobab/commit/
> 80f7e1c144103d52a877f2d42db6a427867591f6

Yes, I can confirm that I tested the schema after path and it passes validation.

no erorrs in 
baobab-3.28.0-2.el8.x86_6

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:3553