Virtuoso Universal Server is a middleware and database engine hybrid that combines the functionality of a traditional RDBMS, ORDBMS, virtual database, RDF, XML, free-text, web application server and file server functionality in a single system. Rather than have dedicated servers for each of the aforementioned functionality realms, Virtuoso is a "universal server"; it enables a single multithreaded server process that implements multiple protocols. The open source edition of Virtuoso Universal Server is also known as OpenLink Virtuoso. The software has been developed by OpenLink Software with Kingsley Uyi Idehen and Orri Erling as the chief software architects.
Read more about Virtuoso Universal Server: History, Functionality Realms, Query Language Support, Usage Scenarios, Related Products and Tools, Platforms, Licensing
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—Christopher Hampton (b. 1946)
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—Richard M. Hare (b. 1919)