List<MatchElement> matchElements = 
		((MatchElement) matchModelObject.eContents().get(0)).getSubMatchElements();
List<DiffGroup> diffGroups = new ArrayList<DiffGroup>();
		
TreeIterator<EObject> iterator = diffObject.eAllContents();
while (iterator.hasNext()) 
{
	EObject next = iterator.next();
	if (next instanceof DiffGroup) 
	{
		diffGroups.add((DiffGroup)next);
	}
}
List<MatchElement> equalObjects = new ArrayList<MatchElement>(matchElements.size());
for (MatchElement match : matchElements) 
{
	DiffGroup correspondingGroup = null;
	for (DiffGroup group : diffGroups) 
	{
		if (((Match2Elements) match).getRightElement() == group.getRightParent()) 
		{ 
		// Note : not sure that instance equality is enough
			correspondingGroup = group;
			break;
		}
	}
			
	if (correspondingGroup == null) 
	{
		equalObjects.add(match);
	} 
	else 
	{
		diffGroups.remove(correspondingGroup);
	}
}