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owljenaontology

How to clone a JENA OntModel to another with a different ModelSpec

I have an OntModel in Jena with an OWL_MEM_RDFS_INF ModelSpec. However I created a utility to count the number of individuals, properties, etc... in the model. As explained here it takes forever to execute the model.listIndividuals() method which is normal because I am using some reasoning abilities.

It's further demonstrated because if I use the basic OWL_MEM ModelSpec I don't have any problem.

I tried to clone the model graph and use another ModelSpec by using what's explained here:

  Model copyOfOntModel = ModelFactory.createModelForGraph(model.getGraph());
  OntModel newModel = new OntModelImpl(OntModelSpec.OWL_MEM, copyOfOntModel);

But it still takes forever when I execute the model.listIndividuals() method. Is there a way to clone the model but use the basic ModelSpec for example?

Solution

  • I applied what UniformedUser said, but as as the result of the getRawModel() method is not an OntModel, I just did:

      Model _model = model.getRawModel();
  OntModel newModel = new OntModelImpl(OntModelSpec.OWL_MEM, _model);

    And it just works!!