New Release: 4.5.6


OpenLink Software are pleased to announce a new release of Virtuoso, Open-Source Edition, version 4.5.6.

This version includes the following enhancements to the core Universal Server Engine:

* New declarative RDF Views language for generating "Virtual RDF Graphs" from SQL data, by mapping SQL to RDF in real time. This means that any relational data stored in Virtuoso or any other relational database can be converted seamlessly to RDF and queried with SPARQL without making an RDF copy of the data itself
* Enhanced RDF Triple Store
* Support for the RDF NET Protocol for reading and writing to Triple Store
* Support for the Semantic Bank Protocol for reading and writing to Triple Store (Virtuoso is now a bona-fide PiggyBank backend)
* SPARQL Processor performance-enhancements
* New AJAX-based Interactive SPARQL Query GUI
* Added 'dataspace' SPARQL storage with an example for users/groups
* Bitmap index support - This is a generic SQL and engine enhancement that delivers dramatic space-savings and incresed performance especially in RDF triple-storage and many business-intelligence workloads.
* Documentation updates covering: RDF APIs, the ATOM and GData protocols
* Runtime hosting for PHP5 in addition to PHP4
* Online Documentation and Tutorials now mapped to SIOC ontology thereby presenting documentation as an RDF data-set accessible to SPARQL Queries
* Engine enhancements including automatic background compaction for up to 30% less space usage for typical relational or RDF databases, better SMP behavior with shorter critical sections, fixes in transaction logic and more
* Fixed a GPF on nesting calls to bif_exec.

The release also includes the following enhancements to the OpenLink Data Spaces (ODS) application suite:

* Built-in support for the Semantically Interlinked Online Communities (SIOC) Ontology
* Built-in support for the FOAF (Friend Of A Friend) Ontology
* Built-in support for the AtomOWL Ontology
* Built-in support for the SKOS (Simple Knowledge Organization System) Ontology
* New SPARQL usage examples demonstrating SIOC, FOAF, SKOS and AtomOWL based on their use across each ODS application realm
* GeoURL support in the ODS-Weblog application
* Support for OpenID for browser-based authentication (client- and server-side)
* Support for Yadis authentication discovery protocol (client- and server-side)
* Significantly improved UI

For more information please see:

Virtuoso Open Source Edition Links:
Home Page:
Download Page:

OpenLink Data Spaces Links:
Home Page:
SPARQL Usage Examples (re. SIOC, FOAF, AtomOWL, SKOS):
Interactive SPARQL Demo:

OpenLink AJAX Toolkit (OAT) Links:
Project Page:
Live Demonstration:


Tim Haynes
OpenLink Software

Posted by Tim Haynes 2006-11-01

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