Object Identity and Database Query

In chapter 15, we characterised an object-oriented DBMS as one that: a)provides a number of system data classes designed for database creation; these include classes to define persistent database objects, to create data structures, and to create application-specific user interfaces for data manipulationb)supports inheritance and class definition expressions to create user-defined application-specific data classesc)allows users to create, modify and access a database through predefined methods of the system data classes