Task 9

SCHEMA task9;
    ENTITY person;
        name: STRING;
        age: INTEGER;
        sex: STRING;
        WHERE
            a: age >= 0;
    END_ENTITY;
    ENTITY employee;
        SUBTYPE OF (person);
        speciality: STRING;
        passport: STRING;
        UNIQUE
            p: passport;
        WHERE
            a: age >= 14;
    END_ENTITY;
END_SCHEMA;