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...the parent class for all other classes in the model. We say that a class that is the descendent from a parent inherits the properties of Research Journal of Recent Sciences ____________________________________________________________ ISSN 2277-2502 Vol. 1 (ISC-2011), 419-421 (2012) Res. J. Recent Sci. International Science Congress Association 420 the parent class. As needed, these properties can be modified and extended in the descendent class. An object is composed of two basic elements: variables and methods. An object holds three basic variables types: (1) Object class (2) Object ID (OID) (3) Data Stores. Figure-1 Object-oriented database Methods perform two basic functions: They communicate with other objects and they perform reads and updates on the data in the object. Methods communicate with other objects by sending messages. Methods perform all reading and writing of the data in an object. For this reason, we say that the data is encapsulated in the object. This is one of the important differences between object-oriented and relational databases. All control for access, modification, and integrity start at the object level. For example, if no method exists for updating a part...