Noob question about "delete"

[Rodrigo Sebastián Alfonso]

Hi guys,

I have a very basic question, i dunno if its my error or just that ANT does
not allow it, but when I call the delete command, like so:

<delete dir="${bin.dir}" />

All it does is erase the children of ${bin.dir}, but not ${bin.dir} itself,
I've tested this in windows 7 and ubuntu 9.04 but nothing seems to solve it,

Could you give me a hand?? Is there something I can do?

Thanks a lot!!!