Abstract
This article proposes a model for multidatabase interoperability whereby a formal model and multidatabase language of Jupiter ∗ ∗ Partially funded under the ESPRIT Programme of the Commission of the European Union as part of the EDITH Project 7507, European Distributed Information Technology for Healthcare. are introduced and the formal semantics of the multi-database language is defined in terms of the formal model. The development of the model is incremental in approach, starting with relational model semantics and extending this semantics to a multirelational model. Due to space requirements we only outline the multirelational part of our work and take the single relational part as given. The contribution of this article is that it defines a uniform formal framework for the investigation of properties of multidatabase systems and their languages. An architecture and implementation language are defined and a CORBA-based prototype: the Jupiter 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 interoperability; and the models and languages of the legacy applications and subsystems.
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