Translations:Part Feature/19/en


 * The first argument indicates the type of object, in this case,.
 * The second argument is a string that defines the attribute. If it is not provided, it defaults to the same name as the class, that is, . The  can only include simple alphanumeric characters, and the underscore, . If other symbols are given, these will be converted to underscores; for example,  is converted to.