WxT uses a three-part semantic versioning nomenclature within the constraints of drupal.org's current capabilities. See this drupal.org issue for the latest.
The three parts of our versioning system are MAJOR.FEATURE.SPRINT. However, due to the current constraints of drupal.org, there is no separator between the FEATURE and SPRINT digits. This also limits WxT to ten sprint releases before releasing a new feature.
Given the following tag: 8.x-2.15:
| 8 | Major version of Drupal Core |
| x | |
| 2 | Major version of WxT |
| 1 | Feature release of WxT. Also increments with minor core releases. |
| 5 | Sprint release between feature releases |
WxT typically makes a sprint release every four weeks. We'll also use sprint releases to package new minor releases of Drupal Core with WxT as they become available. When this happens, we will also increment the feature release/minor version number of WxT - about once every six months.