If you need to wipe all traces for some objects in your svn repository, you can do something like this:
# svnadmin dump REPOS_PATH | svndumpfilter \
<include|exclude> $string | \
svnadmin load REPOS_PATH_NEW
# mv REPOS_PATH REPOS_PATH_backup && REPOS_PATH_NEW \
REPOS_PATH
The Remove (obliterate) trees from subversion repository by Cyconet Blog, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License. Terms and conditions beyond the scope of this license may be available at blog.waja.info.
Brunner Bäcker
Aldi
Städtischer Kinderspielplatz
Kindergarten Am Storchennest
Volksfestplatz Bayreuth
This does not always work though, as you can read here:
http://blogs.quintor.nl/bbottema/2008/03/01/subversion-obliterate-the-forgotten-feature/