Version numbering & Upgrades
Version numbering of all JoomlaXT extensions follows the following scheme:
Version.Release.Patch
Patch: patches are released frequently (sometimes daily). Patches usually only fix bugs and/or change or add functionality that is not actually a bug, but does not work as expected by the majority of the users. Usually a patch fixes several bugs, however in urgent cases (e.g. a security vulnerability) a patch could also be released to fix only one bug.
The patch level is indicated with a 2 digit number
Release: New releases(also called functional enhancement releases) contain new or significantly changed functionality and/or layout. New releases are usually only published several times a year.
The release is indicated with a 2 digit number
Version: New versions are released if there are significant architectural changes. In contrary to releases and patches no direct upgrade can be guaranteed for new versions.
The version is indicated with a 1 or 2 digit number.
Example
The patch 1.24.16 of pollXT fixed some minor bugs
The release 1.24.xx of pollXT introduced AJAX technology in backend and frontend (To be honest: This is probably not a good example, usually it would have been a version jump, however the transition was done slowly with various releases, so the version stayed the same)
The version 2.xx.xx of pollXT made an architectural change from a Joomla 1.0 extension to a Joomla 1.5 native extension

