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Issue No.12 - December (1991 vol.24)
pp: 12-18
<p>A complete framework for enumerating and classifying the types of multidatabase system (MDBS) structural and representational discrepancies is developed. The framework is structured according to a relational database schema and is both practical and complete. It was used to build the UniSQL/M commercial multidatabase system. This MDBS was built over Structured-Query-Language-based relational database systems and a unified relational and object-oriented database system named UniSQL/X. However, the results are substantially applicable to heterogeneous database systems that use a nonrelational data model (for example, an object-oriented data model) as the common data model and allow the formulation of queries directly against the component database schemas.</p>
Won Kim, Jungyun Seo, "Classifying Schematic and Data Heterogeneity in Multidatabase Systems", Computer, vol.24, no. 12, pp. 12-18, December 1991, doi:10.1109/2.116884
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