How to `chmod -R +w` with Ant, files and folders?

I'd like to do the equivalent of a chmod -R +w foo/ in an Ant build script.

So far I'm using this:

<chmod perm="g+w">
   <dirset dir="${basedir}/foo">
   </dirset>
   <fileset dir="${basedir}/foo">
   </fileset>
</chmod>

Is there a neater way to write that to include files and folders recursively?