Subversion doesn't distinguish between filesystem space and «branch» space; branches and tags are ordinary directories within the filesystem. This is probably the single biggest mental hurdle a CVS user will need to climb. Read all about it in Глава 4, Ветвление и слияние.
Since Subversion treats branches and tags as ordinary
directories, always remember to check out the
trunk
(http://svn.example.com/repos/calc/trunk/)
of your project, and not the project itself
(http://svn.example.com/repos/calc/). If
you make the mistake of checking out the project itself,
you'll wind up with a working copy that contains a copy of
your project for every branch and tag you
have.[59]