Thursday, September 19, 2013

-ontop- v1.9 released!

We are happy to announce the availability of  -ontop- v1.9

a Java framework to query RDBMS using SPARQL over RDF(s) and OWL ontologies. Get
it at:


This release continues with the project's refactoring, cleaning of code, dependencies and internal documentation. We also added two very exciting new features. And last, a bunch of implementation improvements related to, both, performance and bug fixing. Here goes a summary:

  • FEATURE: Hybrid RDF graphs! This is a unique new feature in ontop that no other R2RML system has (TTBOMK). Now you have combine data coming from mappings and still have some RDF triples. This lets you store most of the data on the DB, but keep some facts of knowledge in the ontology as triples (ABox facts). For more info see this post:
  • FEATURE: Now ontop supports mappings with URI templates in Class or Properties! For more info check this link:

  • IMPROVEMENT: We cleaned a lot of dependencies in ontop, you will see that our package is now half the size as before.
  • IMPROVEMENT: Upgraded libraries. Now we link to Sesame 2.7.6, OWLAPI 3.4.5 and Protege 4.3
  • BUF FIXES: Critical bug fixes in CONSTRUCT and DESCRIBE queries, as well as in the code that matches URI's to URI templates. Several bugfixes in ontopPro and the SPARQL end-point.



We also prepared a new tutorial that guides you through the first steps of using ontop and ontopPro (the Protege 4 plugin), and how it can be used for data access and data integration. Find it here:

The -ontop- team

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