Jena load ontology imports

[Johan Kumps <jo...@telenet.be>]

Hi all,

I managed to load owl files into a Jena Model and persist it in an SQL
datase using SDB. The triples in these ontologies can be used to
reason with but the ontologies beiing imported using owl:import are
not in the model. What should I do to fix this.

Another question I have is how I can materialize all inferences at
application startup in order to maximize performance of the
application.

Kind regards for helping me out.

Johan

Re: Jena load ontology imports

[Dave Reynolds <da...@gmail.com>]

On 19/07/12 18:42, Johan Kumps wrote:
> Hi all,
>
> I managed to load owl files into a Jena Model and persist it in an SQL
> datase using SDB. The triples in these ontologies can be used to
> reason with but the ontologies beiing imported using owl:import are
> not in the model. What should I do to fix this.

If you want to store the import-closure as a single model in your 
database then the easy route would be to load the OWL into an in-memory 
OntModel and then materialize the whole closure into your target 
destination:

     storemodel.add(  ontmodel ) ;

[It is also possible to use the OntDocumentManager to allow you store 
all these ontologies separately and do the import-closure at runtime 
from the store. However, that requires a ModelMaker wrapper which I'm 
not sure is available for SDB.]

> Another question I have is how I can materialize all inferences at
> application startup in order to maximize performance of the
> application.

Similar pattern to the above. Create an (in-memory) InfModel/OntModel 
with an appropriate reasoner then copy the relevant inferences out to 
your storage model. If we want to materialize the entire 
inference-closure then again storemodel.add() will do this.

Dave