// FSS/API etc created single element axiom.
// but this is coding around a problem in the spec.
checkSingletonDisjointFixup(e1, DisjointClasses(e1, e1));
checkSingletonDisjointFixup(OWLThing(),
DisjointClasses(OWLThing(), OWLThing()));
OWLDisjointClassesAxiom singleClassDisjointAxiom = DisjointClasses(e1);
checkSingletonDisjointFixup(e1, singleClassDisjointAxiom);
OWLAxiom validAxiom = DisjointClasses(e2, e3);
// when
addAxioms(singleClassDisjointAxiom, validAxiom);
OWLOntology reloaded = roundTrip(o,