Iterator it = mainExclusionMap.entrySet().iterator();
while ( it.hasNext() )
{
Map.Entry entry = (Entry) it.next();
String key = (String) entry.getKey();
Exclusion mainExclusion = (Exclusion) entry.getValue();
Exclusion parentExclusion = (Exclusion) parentExclusionMap.get( key );
if ( parentExclusion == null )
{
merged.add( mainExclusion );
}