Can we use relative paths in svn:externals propset?

[David Bartmess]

I have two projects under a single repository, with A being dependent on 
B being checked out.

To set the svn:externals propset, can I use a relative path for the 
checkout directory for the depending (B) directory?

Such as :

svn propset svn:externals "../buildsupport 
http://<URL>/buildsupport/trunk" BuildScripts

Will this work? I can't afford to try it on that repository since it's a 
live development repository...

Thanks!

--
"Dingo" Dave Bartmess
Broomfield, CO. USA
http://edingo.net