Exercise 12.25: Convert the example of GEOMETRY_OBJECTs given in Section 12.1.5 from the functional notation to the notation given in Figure 12.2 that distinguishes between attributes and operations. Use the keyword INHERIT to show that one class inherits from another class.

Exercise 13.7: Create part of an XML instance document to correspond to the data stored in the relational database shown in Figure 5.6 such that the XML document conforms to the XML schema document in Figure 13.5.

define class EMPLOYEE type tuple ( Fname: string; Minit: char; Lname: string; Ssn: string; Birth_date: DATE; Address: string; Sex: char; Salary: float; Supervisor: EMPLOYEE; Dept: DEPARTMENT; ); operations age: integer; create_emp: EMPLOYEE; destroy_emp: boolean; end EMPLOYEE; define class DEPARTMENT type tuple ( Dname: string; Dnumber: integer; Mgr: tuple ( Manager: EMPLOYEE; Start_date: DATE; ); Locations: set (string); Employees: set (EMPLOYEE); Projects set (PROJECT); ); operations no_of_emps: integer; create_dept: DEPARTMENT; destroy_dept: boolean; assign_emp (e: EMPLOYEE): boolean; (* adds an employee to the department *) remove_emp (e: EMPLOYEE): boolean; end Demoves an employee from the department *) dinTMENT; Figure 13.5: An XML schema file called company