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:
Home Page:
http://virtuoso.openlinksw.com/wiki/main/
Download Page:
http://virtuoso.openlinksw.com/wiki/main/Main/VOSDownload
OpenLink Data Spaces:
Home Page:
http://virtuoso.openlinksw.com/wiki/main/Main/OdsIndex
SPARQL Usage Examples (re. SIOC, FOAF, AtomOWL, SKOS):
http://virtuoso.openlinksw.com/wiki/main/Main/ODSSIOCRef
Interactive SPARQL Demo:
http://demo.openlinksw.com/isparql/
OpenLink AJAX Toolkit (OAT):
Project Page:
http://sourceforge.net/projects/oat
Live Demonstration:
http://demo.openlinksw.com/DAV/JS/oat/index.html
Technorati Tags: database, databases, open-source, OpenLink, RDBMS, RDF, semantic web, Semantic Web, SPARQL, virtuoso
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