if ( oldMap == newMap ) return true; else if ( oldMap == null )
if ( oldMap == null )
	private static boolean isCompatibleRSMap( Map oldMap, Map newMap )	{		if ( oldMap == newMap )			return true;		else if ( oldMap == null )			return newMap.size( ) == 0;		else if ( newMap == null )			return oldMap.size( ) == 0;		return oldMap.size( ) >= newMap.size( );	}