assert hrn != null;
Iterator<ReferenceEdge> itrEdge = referencees.iterator();
while( itrEdge.hasNext() ) {
ReferenceEdge edge = itrEdge.next();
if( edge.getDst().equals(hrn) &&
assert hrn != null;
Iterator<ReferenceEdge> itrEdge = referencees.iterator();
while( itrEdge.hasNext() ) {
ReferenceEdge edge = itrEdge.next();
if( edge.getDst().equals(hrn) &&