[Pellet-users] Save A-Box and java.lang.UnsupportedOperationException

[Christiane Telöken]

Dear Pellet-users,

I am using Jena and Pellet 1.5 and I have an OWL-DL-ontology with the 
expressivity ALCHF(D) which you will find in the attachment.

I would like to add a statement to a model and save the model 
separately. Doing this results in a warning and then in an exception.

My statements are contained in this datastructure:

   public ArrayList <Statement> statementResources = new ArrayList 
<Statement> ();

The code looks like:

     Statement stmt = null;
     Statement newStmt = null;
     Resource res;
     Property prop;
     String obj;

     SaveABox newAbox = currentAbox;

     for (int i = 0; i < currentAbox.statementResources.size(); i++){
       stmt = newAbox.statementResources.get(i);

       if (stmt.getSubject().toString().equals(newElement)){
         prop = stmt.getPredicate();
         obj = stmt.getObject().toString();
         newStmt = ontoModel.createStatement(res, prop, obj);

         System.out.println (newStmt);


##################################################################################
The statement looks fine and correct:
[http://www.owl-ontologies.com/Ontology1200661107.owl#NewInstance_1, 
http://www.owl-ontologies.com/Ontology1200661107.owl#hasGoal, 
"http://www.owl-ontologies.com/Ontology1200661107.owl#InGoalRadium224"]
##################################################################################


         Model model = ontoModel.add(res, prop, obj);

##################################################################################
Here, Pellet gives a warning:
  WARN [main] (KnowledgeBase.java:773) - Ignoring literal value 
literal(http://www.owl-ontologies.com/Ontology1200661107.owl#InGoalRadium224,(),()) 
for object property 
http://www.owl-ontologies.com/Ontology1200661107.owl#hasGoal
##################################################################################


         try{
           model.commit();
         }
         catch (Exception e){
           System.out.println (e);
         }

##################################################################################
Pellet throws this exception:
java.lang.UnsupportedOperationException: this model does not support 
transactions
##################################################################################
       }
     }
   }

The objective of my work is to change the A-Box of the ontology and save 
it separately. As I am a newbie to Pellet and the Jena-framework I am 
not sure if this is the way I should do it.

I would be very glad for any hints why the warning and exception is 
thrown and would be very grateful if somebody could tell me if this is 
the right way to save the A-Box of the ontology.

Thank you for any help in advance,

Christiane



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