. "7.2.0" . . "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."@en . . . . "Virtuoso Universal Server"@en . . . . . . .