Change SVN commit message retroactively?

Question

I would like to re-write a big number of SVN commit messages to a different structure, e.g. prefix a category. From:

\"foo\" now accepts \"bar\" format for con

Answer 1

svn propedit -r N --revprop svn:log URL

URL above is optional if you're already in a working directory. An editor will then appear so that the message can be changed.