有没有办法用Subversion进行反向更新？

I have a branch in an SVN tree which contains the source to a third party product. I need to update that branch with the latest version. If I check it out and copy the new source over the old source, I can easily add the new files and do a commit. However, I would also like make sure that any files that are the old version but not the new version get deleted.I have a branch in an SVN tree which contains t