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Versioned Schemas in Object Databases

This content explores the growing need for advanced schema versioning mechanisms in object-oriented database management systems (OODBMSs), especially for applications like CAD, CASE tools, and web platforms. Traditional schema evolution methods in OODBMSs are limited by the “single schema” approach, which fails to support backward compatibility and logical data independence. To address these limitations, the RiBS (Rich Base Schema) model was introduced and later extended to handle complex object hierarchies. This extended model supports dynamic schema restructuring, version merging, and consistent query processing across versions—key features for modern, evolving data applications. The article also compares related work and highlights the unique contributions of the extended RiBS model in advancing schema versioning.

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