<moya xmlns="http://moyaproject.com"
      xmlns:preflight="http://moyaproject.com/preflight">

    <preflight:check>
        <preflight:fail if="app.settings.fs not in .fs">
            [settings]/fs should be a valid filesystem name, not ${debug:app.settings.fs}
        </preflight:fail>
        <preflight:fail if="app.settings.app_serve not in .apps">
            [settings]/app_serve should be an instance of moya.static that serves the images and thumbnails
        </preflight:fail>
    </preflight:check>

</moya>