the kohaversion is divided in 4 parts : - #1 : the major number. 3 atm - #2 : the functional release. 00 atm - #3 : the subnumber, moves only on a public release - #4 : the developer version. The 4th number is the database subversion. used by developers when the database changes. updatedatabase take care of the changes itself and is automatically called by Auth.pm when needed.