/usr/share/images/desktop-base/debian-edu-joy.xml is in debian-edu-artwork-joy 0.52-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | <background>
<static>
<duration>8640000.0</duration>
<file>
<size width="1280" height="1024">/usr/share/images/desktop-base/debian-edu-joy-wallpaper01_1280x1024.svg</size>
<size width="1600" height="1200">/usr/share/images/desktop-base/debian-edu-joy-wallpaper01_1600x1200.svg</size>
<size width="1920" height="1080">/usr/share/images/desktop-base/debian-edu-joy-wallpaper01_1920x1080.svg</size>
<size width="1920" height="1200">/usr/share/images/desktop-base/debian-edu-joy-wallpaper01_1920x1200.svg</size>
</file>
</static>
</background>
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