Use svn-tag
to tag the complete tree of the ready version to a release version. This creates a snapshot of the currently ready tagged version of all projects named to some version number.
Remember that you have explicitly tag projects ready to become part of the ready-tree (s. svn-ready).
Example:
$ svn-tag V1.2.0
In fact this does a copy of the ready tree to a tree named V1.2.0
This version number is stored and is used in the autobuild as version info for the ready-tree.
(see also svn-tag Usage).