*/
    private void logVisit( SimpleNode node, Object data ) {        Token t1 = node.getFirstToken();         Token t2 = node.getLastToken();        System.err.print( "Visited " + node.getClass().getName() + " token=" + t1.image );         if ( t1==t2)            System.err.println( "" );        else            System.err.println( " to token=" + t2.image );            }