void add(OWLIndividual indi, OWLClassExpression exp)
	{
		HashSet<OWLClassExpression> labels = nodeLabels.get(indi);
		if(labels == null)
		{
			labels = new HashSet<OWLClassExpression>();
			labels.addAll(globalConstraints);
			nodes.add(indi);
			nodeLabels.put(indi, labels);
			HashMap<OWLObjectPropertyExpression, HashSet<OWLIndividual>> relations = new HashMap<OWLObjectPropertyExpression, HashSet<OWLIndividual>>();
			edges.put(indi, relations);
		}
		labels.add(exp.getNNF());

			
	}