/usr/share/glib-2.0/schemas/org.mate.panel.applet.geyes.gschema.xml is in mate-applets-common 1.20.1-3.
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 | <schemalist gettext-domain="mate-applets">
<schema id="org.mate.panel.applet.geyes">
<key name="theme-path" type="s">
<default>''</default>
<summary>Directory in which the theme is located</summary>
<description>Directory in which the theme is located</description>
</key>
</schema>
</schemalist>
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