[DL] Ontop 1.13: New Release

[Rezk Martin]

We are happy to announce the availability of

               -ontop- v.1.13

a Java framework to query ontologies with mappings to databases.

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 already
efficient database in order to enjoy the benefits of the RDF data
model, the SPARQL query language or RDF/OWL2QL inference.
And there is no need for expensive ETL or forward/backward chaining either.

You can use -ontop- as an API, a SPARQL end-point, or as a Protege plugin.

The highlights of this new release include:
-New mechanism to specify DB implicit constraints (such as implicit keys) that are not specified in the DB (this is used for optimisation).
-Command line feature to generate pretty R2RML.
-Stream output in the Protege Plugin.
-Support for Regex operators in the mapping language.
-Proper handling of datatypes in ontology and mappings, including type promotion and type checking.
-Support for HSQL database.
-Improved support for datatypes xsd:date, xsd:time and xsd:gYear


-Bug Fixes:
** Issue with nested equivalences in the unfolder.
** Problem with multiple join conditions in R2RML.
** Cancelling running queries in Protege.
** Blank lines in generated sql.


The system is available for FREE at

   http://ontop.inf.unibz.it/

Please, try it out and help us improve it by sending us your feedback.
Tell us how YOU are using -ontop-!
https://github.com/ontop/ontop/wiki/UseCases

To start using -ontop- try our new tutorials!

-Easy Tutorial: Using Ontop from Protege
-Easy Tutorial: Using Ontop API from Eclipse
(https://github.com/ontop/ontop/wiki)

Cheers,
The -ontop- development team


PS.

Website:
http://ontop.inf.unibz.it

Documentation:
https://github.com/ontop/ontop/wiki

Github:
https://github.com/orgs/ontop/

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