The Version number of Nereid and its module have two parts. The first part indicates the version of Tryton the module is written for and the second part indicates the revision of the module for that series of Tryton.
Let us consider the version number 220.127.116.11, 2.0 indicates that the module works with the Version 2.0 of Tryton and that the module is in the 0.3 revision for the 2.0 series of Tryton.
When a newer, stable version of Tryton is relased by the maintainers, nereid will also be updated to be compatible for the new version. When this is done, the previous version of the module is pushed to maintenance branch.
When updating to a newer series of Tryton, the minor revision begins again from 0.1. For example, if 18.104.22.168 is the last stable version of a nereid module in the 2.4 series and an update to 2.6 series is made, the version of the module would be 22.214.171.124.
To differentiate between a stable version and a development version Tryton uses BSD style even and odd numbers. For example 2.3 indicates a development release of tryton while 2.4 would be the stable version resulting from such development. However, it is not feasible to use the same with Nereid since, we would begin to migrate modules only after a stable version of Tryton would be released.
Therefore, it is necessary to identify if the revision you see on the repository is a stable tip or a development one. For the same, we suffix the version number with dev. Note that the development version 126.96.36.199dev is a version before 188.8.131.52:
>>> from pkg_resources import parse_version >>> parse_version('184.108.40.206dev') < parse_version('220.127.116.11') True
Maintenance branches of current revisions are created whenever a newer version of Tryton is available and the module is updated to the newer version. As of now, the latest available stable release of Tryton is 2.4 and the upcoming 2.6 release has a major change to include the active record design pattern. When the 2.6 version is released the current master branch will be checked out to a new branch called 2.4-maintenance and no further active development will be done on it.
At any point of time, the number of previous releases maintained would be the same as that of Tryton. For example if Tryton release management team stops maintaining version 2.0, the same would happen with Nereid.
Critical bug fixes and security updates will be performed on maintenace releases.