XFree86 Version Numbering Schemes : Version Numbering Scheme for XFree86 4.0.x.
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## 3. Version Numbering Scheme for XFree86 4.0.x.

The version numbering format for XFree86 4.0.x releases is `M.m.nx`, where `M` is the major version number (4), `m` is the minor version number (0), `n` is the sub-minor version number, and `x` is a letter. Full release versions up to and including 4.0.2 were 4.0, 4.0.1, and 4.0.2. Between-release snapshots are indicated by including `x`, a lower case letter. For example, the first post-4.0.1 snapshot was 4.0.1a. Release candidates have been indicated by setting `x` to a one or two letter combination with the first letter being "Z". For example, 4.0.1Z was the first 4.0.2 release candidate.

The next 4.0.x release will be an update release, not a full release. These update releases will be indicated by incrementing the sub-minor version number. So, the first post-4.0.2 update release will be 4.0.3. Between-release snapshots will continue to be indicated with a lower case letter, so the first pre-4.0.3 snapshot will be 4.0.2a.

The following example illustrates the release sequence from 4.0 through to the post-4.0.2 update releases.

`4.0`

  The 4.0 release.

`4.0a`

  The first post-4.0 development snapshot.

`4.0f`

  The sixth post-4.0 development snapshot.

`4.0Z`

  The 4.0.1 release candidate.

`4.0.1`

  The 4.0.1 release.

`4.0.1a`

  The first post-4.0.1 development snapshot.

`4.0.1f`

  The sixth post-4.0.1 development snapshot.

`4.0Z`

  The first 4.0.2 release candidate.

`4.0Zb`

  The third 4.0.2 release candidate.

`4.0.2`

  The 4.0.2 release.

`4.0.2a`

  The first pre-4.0.3 snapshot/release candidate.

`4.0.2c`

  The third pre-4.0.3 snapshot/release candidate.

`4.0.3`

  The 4.0.3 update release.

`4.0.3a`

  The first pre-4.0.4 snapshot/release candidate.

`4.0.4`

  The 4.0.4 update release.

XFree86 Version Numbering Schemes : Version Numbering Scheme for XFree86 4.0.x.
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