MULTIDATABASE INTEROPERABILITY IN THE JUPITER SYSTEM

This article proposes a model for multidatabase interoperability where by a formal model and multidatabase language of Jupiter are introduce d and the formal semantics of the multidatabase language is defined in terms of the formal model, The development of the model is incrementa l in approach, starting with relational model semantics and extending this semantics to a multirelational model, Due to space requirements w e only outline the multirelational part of our work and take the singl e relational part as given. The contribution of this article is that i t defines a uniform formal framework for the investigation of properti es of multidatabase systems and their languages. An architecture and i mplementation language are defined and a CORBA-based prototype: the Ju piter Interoperator, is discussed, Legacy systems are characterized in this article along three related dimensions: the legacy applications themselves; the subsystems which support the legacy applications and i nteroperability; and the models and languages of the legacy applicatio ns and subsystems.