[DL] -ontop- v1.9 now available (OBDA, RDBMS, RDB2RDF mappings, RDF, OWL, RDFS, R2RML, SPARQL, SQL)

Rodriguez-Muro Mariano (A) rodriguez at inf.unibz.it
Thu Sep 19 13:50:08 CEST 2013

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:


If you are interested in virtual RDF graphs, RDB2RDF mappings (e.g., R2RML)
and/or RDFS/OWL2QL reasoning and SQL, then -ontop- is for you. The system
implements the cutting edge in SPARQL-to-SQL and query optimisation techniques,
provides great performance and is packed with unique features.

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 RDFS/OWL 2 QL
inference. There is no need for expensive ETL or forward/backward chaining


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: Upgraded libraries. Now we link to Sesame 2.7.6, 
   OWLAPI 3.4.5 and Protege 4.3

 * IMPROVEMENT: We cleaned a lot of dependencies in 
   ontop, you will see that our package is now half the size as before.

 * 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

Mariano Rodriguez Muro                
KRDB Research Center                  
Faculty of Computer Science           
Free University of Bozen-Bolzano (FUB)
Piazza Domenicani 3,                  
I-39100 Bozen-Bolzano BZ, Italy       

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