We are happy to announce the availability of
-ontop- v1.8
a Java framework to query RDBMS using SPARQL over RDF(s) and OWL ontologies. Is
available as a Sesame and OWLAPI library, SPARQL endpoint and Protege 4 plugin.
If you are interested in virtual RDF graphs, R2RML mappings and/or RDFS/OWL2QL
reasoning, then -ontop- is for you. The system implements the cutting edge
SPARQL-to-SQL and query optimisation techniques that allow it to answer SPARQL
queries using SQL databases while obtaining great performance.
With -ontop-, you don't need to move your data from your DB to enjoy the
benefits of the RDF data model, the SPARQL query language or RDF/OWL2QL
inference. There is no need for expensive ETL or forward/backward chaining
either.
The highlights of this new release include:
* SOURCE CODE IS NOW AVAILABLE (See the new license terms)
* Improved mapping syntax (see full changelog)
* New command line tools to query, automatically generate mappings, generate
RDF/OWL from mappings
* Faster SQL translation
* Improved the SQL queries generated by Quest by avoiding some operations
when unnecessary (e.g., casting), and placing optimally the JOIN conditions
in the SQL query.
* Major restructuring of code for performance and clarity of the API (this is
still ongoing)
* Many important bugfixes for CONSTRUCT, ASK and DESCRIBE queries
* -ontopPro- is now compatible with Protege 4.3
* Many bug fixes
Cheers,
The -ontop- development team
