Announcing Virtuoso Open-Source Edition v5.0.0

Thu, 12 Apr 2007 10:30:29 GMT

All, OpenLink Software are pleased to announce a new release of Virtuoso , Open-Source Edition, version 5.0.0. This version includes:

Significant rewrite of database engine resulting in 50%-100% improvement on single CPU and in some cases up to 300% on multiprocessor CPUs by decreasing resource-contention between threads and other optimizations.
Radical expansion of RDF support including

In-built middleware (called the Sponger) for transforming non-RDF into RDF "on the fly" (e.g. producing Triples from Microformats, REST-style Web Services, and (X)HTML etc.)
Full Text Indexing of Literal Objects in Triple Patterns (via Filter or magic bif:contains predicate applied to Literal Objects)
Basic Inferencing (Subclass and Subproperty Support)
SPARQL Aggregate Functions
SPARQL Update Language Support (Updates, Inserts, Deletions in SPARQL)
Improved Support of XML Schema Type System (including the use of XML Schema Complex Types as Objects of bif:xcontains predicate)
Enhancements to the in-built SPARQL to SQL Compiler's Cost Optimizer
Performance Optimizations to RDF VIEWs (SQL to RDF Mapping)

Various bug-fixes

NOTE: Databases created with earlier versions of Virtuoso will be automatically upgraded to Virtuoso 5.0 but after upgrade will not be readable with older Virtuoso versions. For more information please see: Virtuoso Open Source Edition: