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.
 * The cannot start with a number; it must start with a letter or the underscore, . For example,  is converted to.
 * The is fixed at creation time; it cannot be modified afterwards.
 * The must be unique in the entire document. If the same  is used at creation time with many objects, a sequential number will be appended automatically so that the resulting names are unique; for example, if  already exists, then new objects will be called, , , etc.