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Comment: Adding new graphic and disclaimer about missing tables

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DSpace uses a relational database to store all information about the organization of content, metadata about the content, information about e-people and authorization, and the state of currently-running workflows. The DSpace system also uses the relational database in order to maintain indices that users can browse.

Warning
title1.8 Schema

This Database schema is not fully up to date with DSpace 4.0. 2 additional table to store item level versioning information were added to DSpace 3 are currently not represented in this diagram.

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Most of the functionality that DSpace uses can be offered by any standard SQL database that supports transactions. Presently, the browse indices use some features specific to to PostgreSQL and  and Oracle, so some modification to the code would be needed before DSpace would function fully with an alternative database back-end.

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