/**
  * Gets the next from list.
  *
  * @return the next from list
  */
 private ResolvedConceptReference getNextFromList() {
   try {
     while (hasNext()) {
       int iterator = _currentIterator % _iterators.size();
       ResolvedConceptReferencesIterator itr = _iterators.get(iterator);
       if (itr.hasNext()) {
         _currentIterator++;
         return itr.next();
       } else {
         _currentIterator++;
       }
     }
     return null;
   } catch (Exception e) {
     throw new RuntimeException(e);
   }
 }