svn:externals to another svn:externals issue

Hello all!

I've got an issue with a repo that I manage regarding svn:externals
and have been unable to find any information regarding it (apologies
if the issue has already been brought up and I didn't find it.)

So I've got a pair of projects, we'll call them /tools and /libs.
Under each I'm using ./tags/v1.0 ./tags/v2.0 as well as an
svn:externals of ./tags/latest which points to the most recent tagged
version. This all works fine. What I'd like to do and seem to be
unable is to use svn:externals to point from /tools/tags/v2.0/libs to
/libs/tags/latest, as that directory only exists as a property of it's
parent. I'd like to use this so that I don't have to worry about
updating the libs path for my tools every time I release a new
version.

Does anyone have any ideas on how I might be able to accomplish this
or a more effective way of managing this code?

Thanks!

-- 
Andrew
http://blog.psych0tik.net