Bukkit

Every mod developer uses similar format of versions (major.minor.alpha).
But my version it a bit different I use something like 1.5.c
This would mean the major version is 1
Minor version would be 5.c

Also for every modder the words 'major' and 'minor' have a different meaning. My explanation is:
Major is a must have update due to stability/or features.
".5." is a recommended update if it has a new feature/big bug fix.
".c" means there was something little of importance such as code re-ordering, or tiny bug fix