Unclear syntax for relative addressing of svn:externals, on RHEL 5, subversion-1.6.12

The allowable syntax for svn:externals is a bit unclear in the Redbook.

Shouldn't I be able to set the svn:external to point to a location in
my active repository, such as the below settings?

    svn propset svn:externals "release-1 ^/tags/release-1" .

I seem to be able to set such values, but updating with such values
fails miserably with the subversino-1.6.12, published from RPMforge on
RHEL 5 (for reference to the version I'm using).
Received on 2010-07-09 21:09:15 CEST