For speed and convenience, applications routinely cache XML data locally, and access it through standard parser (SAX) or tree (DOM) interfaces. When the source of this data is a relational database, the consistency and integrity guarantees of the database are sacrificed for speed. This paper presents the ROLEX system (standing for Relational On-Line Exchange with XML), which provides applications "live" virtual XML views of relational data through standard interfaces. This technology, combined with a main-memory database platform, promises to provide data integrity, consistent interoperation with relational applications, and the performance required by busy web or e-commerce applications.
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