DC中的问题

在design compiler中写如下代码：
design_vision> set a [find design "*"]
Information: Defining new variable 'a'. (CMD-041)
{cla_16 carry gen_prop}
design_vision> echo $a
_sel1476

返回的是这个，请问这个是什么啊?
而且在后面foreach中：
foreach subdesign [find design "*"] {
             echo "subdesign is $design_list"
}
输出结果为：subdesign is _sel1153
请问是什么原因啊?

顶一下，不懂

The return is a collection, and it is not a list. That's why you can not use echo.

    Try use the following commands.
query_objects

非常感谢楼上两位，现在可以了！谢谢啊！