inverse Student::courses, relationship Set<Course>courses nverse course students 完整的Course类如下： interface Course attribute integer CourseNo: attribute string coursename attribute string Teacher onship SetStudent>students inverse Student::courses, relationship Set<Course>courses inverse course:students #刷 联系的多样性：多对多、多对一 对多 一对一。 电影类Movie,.演员类Actor,制片公司类Studio,公司总裁类。 电影类与演员类之间是多对多的关系，电影类与制片公司之间是多对一的关系，公司总裁与制片公司之间 是一对一的关系。 ODL表示如下 Interface Movie attribute string Title attribute integer Year attribute integer Length: .blackwhite)Type ship Set <Actor>actors inverse Actor movies relationship Studio ownedby inverse Studio::owns, interface Actor attribute string Name attribute integer Year, relationship Set<Movie>movies inverse Movie:actors interface Studio attribute string Name. attribute string Address relationship Set <Movie>owns :leads interface President attribute string Name relationship Studioleads > 7 inverse Student : : courses; relationship Set <Course> courses inverse course : : students; 完整的 Course 类如下： interface Course { attribute integer CourseNo; attribute string CourseName; attribute string Teacher relationship Set <Student> students inverse Student : : courses; relationship Set <Course> courses inverse course : : students; } 举例： 联系的多样性：多对多、多对一、一对多、一对一。 电影类 Movie，演员类 Actor，制片公司类 Studio，公司总裁类。 电影类与演员类之间是多对多的关系，电影类与制片公司之间是多对一的关系，公司总裁与制片公司之间 是一对一的关系。 ODL 表示如下： Interface Movie{ attribute string Title; attribute integer Year; attribute integer Length; attribute enum Film {color,blackwhite} Type; relationship Set <Actor> actors inverse Actor :: movies; relationship Studio ownedby inverse Studio ::owns; } interface Actor { attribute string Name; attribute integer Year; relationship Set <Movie> movies inverse Movie :: actors; } interface Studio { attribute string Name; attribute string Address; relationship Set <Movie> owns inverse Movie :: ownedby; relationship President leadedby inverse President :: leads; } interface President { attribute string Name; relationship Studio leads