Registers property_id as referring to a property with the name name in a parent class or in an interface implemented by oclass. This allows this class to "override" a property implementation in a parent class or to provide the implementation of a property from an interface.
Internally, overriding is implemented by creating a property of type GParamSpecOverride; generally operations that query the properties of the object class, such as ObjectClass.findProperty or ObjectClass.listProperties will return the overridden property. However, in one case, the construct_properties argument of the constructor virtual function, the GParamSpecOverride is passed instead, so that the param_id field of the gobject.ParamSpec will be correct. For virtually all uses, this makes no difference. If you need to get the overridden property, you can call ParamSpec.getRedirectTarget.