| Plugins can optionally self-report their own semantic version. For plugins that |
| do so, Vault will automatically populate the plugin's version in the catalog |
| without requiring the user to provide it. If users do provide a version during |
| registration, Vault will error if the version provided does not match what the |
| plugin reports. Plugins that report a non-empty version _must_ report a valid |
| [Semantic Version](https://semver.org/) with a leading 'v' added or registration |
| will fail, e.g. `v1.0.0` or `v2.3.2-beta`. |
| |
| Plugins that want to opt into this behavior can implement the version interface. |
| However, it is not a prerequisite; users can still provide a version during |
| registration if the plugin does not implement the version interface. |
| |
| To implement the version interface, plugins should first upgrade the Vault SDK |
| package to at least v0.6.0. |
