- * Returns the URL of the directory, where the mirrored view properties
- * are stored into. Mirrored view properties are used if:
- * - there is no write access for storing the view properties into
- * the original directory
- * - for non local directories
+ * @return True if properties for the given URL exist:
+ * As soon as the properties for an URL have been saved with
+ * ViewProperties::save(), true will be returned. If false is
+ * returned, the default view-properties are used.