Pegasus: a system for seamless integration of heterogeneous information sources

Pegasus, a heterogeneous multidatabase management system that is under development, is described. The goal of the system is to provide facilities for applications to access and manipulate multiple autonomous heterogeneous object-oriented, relational, and other information systems. Pegasus defines a common object model for unifying the data models of the underlying systems. The data language of Pegasus allows transparent as well as explicit access to multiple information systems in a single declarative statement. The Pegasus architecture is described, and attention is given to data integration and query processing in Pegasus.<>