逆置广义表的递归模型如下
上面appEND(ab)功能是将广义表a和b作为元素的广义表连接起来
()(p>tag==) //处理原子
()h=reverse(p>valptrhp) //处理表头
()(p>valptrtp) //产生表尾的逆置广义表
()s>valptrtp=t; //连接
()q>valptrhp=h //头结点指向广义表
[] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] []