Concerning the 'The Three Meanings of "Lock"' box: . http://svnbook.red-bean.com/nightly/en/svn.advanced.locking.html#svn.advanced.locking.meanings . Should that box mention svnsync locks as well?
(These are the svn_ra__get_operational_lock() locks that svnsync takes using the svn:sync-lock revprop, exposed in the UI through the --disable-locks/--steal-lock options to 'svnsync sync'. Note 'svnrdump load' also uses this kind of operational lock.) Cheers, Daniel (Asking because I just ran into an old Debian bug report where a user looked in svnadmin for how to remove an svn:sync-lock; and `svnadmin help | grep lock` wouldn't have helped him.)