/usr/share/glib-2.0/schemas/ is in mate-desktop-common 1.12.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/glib-2.0/schemas/org.mate.accessibility-keyboard.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.accessibility-startup.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.applications-at-mobility.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.applications-at-visual.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.applications-browser.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.applications-office.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.applications-terminal.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.background.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.debug.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.file-views.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.interface.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.lockdown.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.peripherals-keyboard.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.peripherals-mouse.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.sound.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.thumbnail-cache.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.thumbnailers.gschema.xml
/usr/share/glib-2.0/schemas/org.mate.typing-break.gschema.xml