A key that stores a schema object for a preference key. For example, /schemas/desktop/gnome/interface/font_name is a schema key for the /desktop/gnome/interface/font_name preference key.
Hobespen-gako baten eskema-objektua gordetzen duen gakoa. Adibidez, /desktop/gnome/interface/font_name hobespen gakoaren eskema bat da /schemas/desktop/gnome/interface/font_name.