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== Theoretical Foundation for Multi-Model Databases ==
The traditional theory of relations is not enough to accurately describe multi-model database systems. Recent research <ref name="CT">[https://www.vldb.org/pvldb/vol14/p2663-uotila.pdf MultiCategory: Multi-model Query Processing Meets Category Theory and Functional Programming ]</ref> is focused on developing a new theoretical foundation for these systems. [[Category theory]] can provide a unified, rigorous language for modeling, integrating, and transforming different data models. By representing multi-model data as sets and their relationships as functions or relations within the Set category, we can create a formal framework to describe, manipulate, and understand various data models and how they interact.
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