@Override public void iterateOnMapKey(DescriptorIterator iterator,Object element){
  super.iterateOnAttributeValue(iterator,element);
}

@ Override public void iterateOnMapKey ( DescriptorIterator iterator , Object element ) { super . iterateOnAttributeValue ( iterator , element ) ; }
internal : called when iterating through descriptors to handle iteration on this mapping when it is used as a mapkey
