27.1 Discuss the main concepts of the ODMG
Object Model. Give an example to illustrate
each of the concepts.
27.2 What is the function of the ODMG Object
Definition Language?
27.3 What is the function of the ODMG Object
Manipulation Language?
27.4 How does the ODMG GROUP BY clause
differ from the SQL GROUP BY clause?
Give an example to illustrate your
answer.