split a repository

Yo!

I'm just starting to use subversion. So please just point me to the answer - I
probably have missed it.

Working with CVS, I used to remove projects from the repository when they were
finished, and burn them to CD, so that the project documentation has now the
whole project, including all history. Also, I don't have to carry around the
dead weight of all the past projects in the repository (and on all backup
copies).

How do I do this in subversion?

<http://svnbook.red-bean.com/book/book.html#svn-ch-5-sect-3.2> talks about
merging repositories with the --parent-dir option. But the section does not
talk aobut doing the reverse :-(

cheers
-- vbi

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Today is Boomtime, the 4th day of Discord in the YOLD 3170