Class based contextual logic for DOOD

Abstract

Contextual logic provides a mechanism to reason about modules. In this paper, this theory of modules is extended to a context theory of classes where class is in the true spirit of object-oriented databases. The logic, referred to as CLOG, is class-based. CLOG supports class, object identity, multiple role of object, monotonic and non-monotonic inheritance of data and method, method factoring, views, derived and query classes. Views and derived classes are queries in themselves. Objects are pure data terms representing the ground instances of facts in the class. Object identity is a first class term in the logic. Inheritance is handled through delegation.