return visitChildren(node, data);
node.jjtAccept(this, data);  return data;
    public Object visit(SimpleNode node, Object data) {        StringBuffer acc = (StringBuffer) data;        if (node == null) {            System.out.println("Node Is Null!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");            return data;        }        System.out.println("...........SimpleNode..." + acc.toString());        return visitChildren(node, data);    }