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Reasoning About the Updatability of XML Views Over Relational Databases

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Executive Summary

XML has become an important medium for data exchange, and is also used as an interface to - i.e. a view of - a relational database. While previous work has considered XML views for the purpose of querying relational databases (e.g. Silkroute), in this paper the problem of updating a relational database through an XML view is considered. Using the nested relational algebra as the formalism for an XML view of a relational database, the problem of when such views are updatable is studied. The results rely on the observation that in many XML views of relational databases, the nest operator occurs last and the unnest operator does not occur at all.

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