When added to an app’s default.meta file, export = system makes one of its views available to other apps. This means that the view is visible and searchable by all users. The other options are invalid because export = app means that the view is visible and searchable only within the app, export = none means that the view is not visible or searchable by any user, and export = view is not a valid value for the export attribute. For more information, see About configuration file structure and inheritance.