EXTENDING OMT TO SUPPORT BOTTOM-UP DESIGN MODELING IN A HETEROGENEOUSDISTRIBUTED DATABASE ENVIRONMENT

We present an extension to the object model of OMT to cope with bottom -up database design. By investigation, it was discovered that OMT as i t stands is inadequate to capture some real world semantic and structu ral information needed to perform schema integration for pre-existing databases in a heterogeneous distributed database environment. Therefo re the proposed extension, called Integrated OMT (IOMT), was formally defined and an appropriate extended graphical notation was produced as a part of our work. This extended form was implemented and applied ef fectively using a tool which we call the schema meta-integration/visua lisation system (SMIS/SMVS).