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MonetDB database system with XQuery front-end
Have you ever tried to work with XML documents? If so, you probably have noticed that these documents are not easy to handle. To query these documents a query-language has been created: XQuery and the XQuery Update Facility (XQUF). What SQL is for relational databases, is XQuery/XQUF for XML-databases. However, existing prototype implementations are often too slow to be used beyond toy examples.
MonetDB/XQuery provides XML database functionality comprising quite complete support for the XQuery language, including modules, transaction-safe XQUF updates, user-defined functions, and a query cache (using XQuery modules). The system has very high performance and is scalable to large XML collections.