Joomla Version Convention

Joomla! release versioning follows a numerical convention comprised of three numbers: Major, Minor and Maintenance. The version is presented in the major.minor[.maintenance] format.

Major Release Number (X.1.1)

An increment of the major number generally indicates a major rework or rewrite of the code base.

May be completely incompatible with prior major releases.

Minor Release Number (1.X.1)

An increment of the minor number usually indicates a significant change to functionality or architecture.

Moderate to high level of backward compatibility with previous minor increments.

Maintenance Release Number (1.1.X)

An increment of the maintenance number usually indicates bug fixing within the minor release and possibly small enhancements and limited new features.

Fully backward compatible with previous maintenance increments.
Structure

Each full release of Joomla! exists in its own branch of the source tree where it is maintained independently of the trunk. For the purposes of the source tree each major or minor version number increment represents a new full release.

Full Releases are subject to both Alpha and Beta test periods. There is no set time period for these test periods but the Beta will not be less than three (3) calendar weeks. This is to provide adequate compatibility testing by third party developers.

Maintenance Releases are released on an as-needed basis. These releases will be subject to in-house quality control only and be made available for immediate use. The frequency of Maintenance Releases will decrease as the codebase matures. Maintenance Releases aim to improve the quality of stable releases that have been deployed by users and administrators, yielding a better return on investment because you do not have to wait for a full release for a bug to be fixed.

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