public static function loadCssFile(\core_kernel_classes_resource $item, $lang, $styleSheet) {

        $directory = \taoItems_models_classes_ItemsService::singleton()->getItemDirectory($item, $lang);

        // no user style sheet has been created yet
        $file = $directory->getFile($styleSheet);
        if (! $file->exists()) {
            \common_Logger::d('Stylesheet ' . $styleSheet . ' does not exist yet, returning empty array');
            return array();
        }

        return self::cssToArray($file->read());
    }