for (ConceptDescription conceptDescription : r.getConceptDescriptions()) {
final String objectConceptUri = conceptDescription.getUri();
if(objectConceptUri!=null ){
if (r.getOnproperty() != null) {
relatedNode = new RelationNode(conceptDescription.getName());
edges.add(new TextEdge(relationsRoot,relatedNode,formatRelation(r.getOnproperty())));
} else if (isSuperclassOfRelation(r)) {
relatedNode = new SuperClassNode(conceptDescription.getName());
edges.add(new LineEdge(superClassRoot, relatedNode));
} else {
// otherwise, the object _is superclass of_ this, so...