From frederic...@gmail.com on May 31, 2013 06:39:28

Hi,

OWLGraphEdges returned by method such as getIncomingEdges or getOutgoingEdges have no ontology set (getOntology() returns null).

This is problematic when trying to remove or add axioms based on such OWLGraphEdges. For instance:

OWLSubClassOfAxiom ax = factory.getOWLSubClassOfAxiom((OWLClassExpression) edge.getSource(), (OWLClassExpression) edgeToTargetExpression(edge));
RemoveAxiom remove = new RemoveAxiom(edge.getOntology(), ax);
manager.applyChange(remove);
//fail with exception:
//org.semanticweb.owlapi.model.ImmutableOWLOntologyChangeException: Cannot apply changes to immutable ontology: null

It would be great if the returned OWLGraphEdges had their ontology attribute set.

Original issue: http://code.google.com/p/owltools/issues/detail?id=66