public void visit(OWLHasKeyAxiom axiom) {
   axiom.getClassExpression().accept(this);
   for (OWLPropertyExpression prop : axiom.getPropertyExpressions()) {
     prop.accept(this);
   }
   processAxiomAnnotations(axiom);
 }
 @Override
 public void visit(OWLHasKeyAxiom axiom) {
   axiom.getClassExpression().accept(this);
   OWLClassExpression ce = (OWLClassExpression) obj;
   Set<OWLPropertyExpression<?, ?>> props = duplicateSet(axiom.getPropertyExpressions());
   obj = dataFactory.getOWLHasKeyAxiom(ce, props, duplicateAxiomAnnotations(axiom));
 }
 @Override
 public void visit(OWLHasKeyAxiom axiom) {
   write("HasKey");
   axiom.getClassExpression().accept(this);
   for (OWLPropertyExpression<?, ?> p : axiom.getPropertyExpressions()) {
     writeSpace();
     p.accept(this);
   }
 }
  public Set<OWLAxiom> write(OWLClass cls) {
    Set<OWLAxiom> axioms = new HashSet<OWLAxiom>();
    axioms.addAll(writeEntityStart(CLASS, cls));

    if (!isFiltered(AxiomType.EQUIVALENT_CLASSES)) {
      for (OWLOntology ontology : getOntologies()) {
        SectionMap equivalentClasses = new SectionMap();
        for (OWLEquivalentClassesAxiom ax : ontology.getEquivalentClassesAxioms(cls)) {
          if (ax.getClassExpressions().size() == 2) {
            if (isDisplayed(ax)) {
              for (OWLClassExpression equivCls : ax.getClassExpressionsMinus(cls)) {
                equivalentClasses.add(equivCls, ax);
              }
              axioms.add(ax);
            }
          }
        }
        equivalentClasses.remove(cls);
        writeSection(EQUIVALENT_TO, equivalentClasses, ",", true, ontology);
      }
    }

    if (!isFiltered(AxiomType.SUBCLASS_OF)) {
      for (OWLOntology ontology : getOntologies()) {
        SectionMap superclasses = new SectionMap();
        for (OWLSubClassOfAxiom ax : ontology.getSubClassAxiomsForSubClass(cls)) {
          if (isDisplayed(ax)) {
            superclasses.add(ax.getSuperClass(), ax);
            axioms.add(ax);
          }
        }
        writeSection(SUBCLASS_OF, superclasses, ",", true, ontology);
      }
      if (renderExtensions) {
        for (OWLOntology ont : getOntologies()) {
          SectionMap subClasses = new SectionMap();
          for (OWLSubClassOfAxiom ax : ont.getSubClassAxiomsForSuperClass(cls)) {
            if (isDisplayed(ax)) {
              subClasses.add(ax.getSubClass(), ax);
              axioms.add(ax);
            }
          }
          writeSection(SUPERCLASS_OF, subClasses, ",", true, ont);
        }
      }
    }
    if (!isFiltered(AxiomType.DISJOINT_CLASSES)) {
      for (OWLOntology ontology : getOntologies()) {
        Set<OWLAxiom> pairwiseDisjointClassesAxioms = new HashSet<OWLAxiom>();
        SectionMap disjointClasses = new SectionMap();
        for (OWLDisjointClassesAxiom ax : ontology.getDisjointClassesAxioms(cls)) {
          if (isDisplayed(ax)) {
            if (ax.getClassExpressions().size() == 2) {
              pairwiseDisjointClassesAxioms.add(ax);
              OWLClassExpression disjointWith = ax.getClassExpressionsMinus(cls).iterator().next();
              disjointClasses.add(disjointWith, ax);
            }
            axioms.add(ax);
          }
        }
        writeSection(DISJOINT_WITH, disjointClasses, ", ", false, ontology);
        if (renderExtensions) {
          // Handling of nary in frame style
          for (OWLDisjointClassesAxiom ax : ontology.getDisjointClassesAxioms(cls)) {
            if (isDisplayed(ax)) {
              if (ax.getClassExpressions().size() > 2) {
                Set<OWLClassExpression> allDisjointClasses =
                    new TreeSet<OWLClassExpression>(ax.getClassExpressions());
                allDisjointClasses.remove(cls);
                axioms.add(ax);
                writeSection(DISJOINT_CLASSES, allDisjointClasses, ", ", false, ontology);
              }
            }
          }
        }
      }
    }
    if (!isFiltered(AxiomType.HAS_KEY)) {
      for (OWLOntology ontology : getOntologies()) {
        for (OWLHasKeyAxiom ax : ontology.getHasKeyAxioms(cls)) {
          if (isDisplayed(ax)) {
            SectionMap map = new SectionMap();
            map.add(ax.getPropertyExpressions(), ax);
            writeSection(HAS_KEY, map, ", ", true, ontology);
          }
        }
      }
    }
    if (!isFiltered(AxiomType.CLASS_ASSERTION)) {
      for (OWLOntology ontology : getOntologies()) {
        SectionMap individuals = new SectionMap();
        for (OWLClassAssertionAxiom ax : ontology.getClassAssertionAxioms(cls)) {
          if (isDisplayed(ax)) {
            if (renderExtensions || ax.getIndividual().isAnonymous()) {
              individuals.add(ax.getIndividual(), ax);
              axioms.add(ax);
            }
          }
        }
        writeSection(INDIVIDUALS, individuals, ",", true, ontology);
      }
    }
    if (!isFiltered(AxiomType.SWRL_RULE)) {
      for (OWLOntology ontology : getOntologies()) {
        Set<OWLAxiom> rules = new HashSet<OWLAxiom>();
        for (SWRLRule rule : ontology.getAxioms(AxiomType.SWRL_RULE)) {
          if (isDisplayed(rule)) {
            for (SWRLAtom atom : rule.getHead()) {
              if (atom.getPredicate().equals(cls)) {
                writeSection(RULE, rules, ", ", true, ontology);
                break;
              }
            }
          }
        }
      }
    }
    writeEntitySectionEnd(CLASS.toString());
    return axioms;
  }