三类，居民，成人，教师。居民包括身份证号，姓名，性别，出生日期。成人继承于居民，但是包括学历，职业。教师继承于成人，但有职称，职务。-Three, residents, adults, teachers. Residents, including ID number, name, sex, date of birth. Adult inherited from residents, but includes education, occupation. Teachers inheritance