From OpenSCADAWiki
| style="border:1px solid gray; vertical-align: top; padding: 2px;" | POLICY: OpenSCADA versions form in the two branches:
- Work: the development-work version with the group commit of the changes to the source repository (per about a week), and building for some number of Linux distributions of the developers and directly specified ones by the subscription for support — by an actual package of the technical support.
- 1+rNNNN, where "NNNN" — the SVN (SubVersion) revision number.
- LTS (Long Term Support): formal release of the last "Work" version with support up to the next iteration: "Work" -> "LTS" (zero update number), "Work"++.
- 0.9.U.S, where:
- "U" — number of the regular update (at the year begin); at the regular updating all fixes and improvements from the "Work" version are merged to "LTS" and also those that break some API compatibility but do not break the functionality and data compatibility; and U++;
- "S" — number of the service update; for any critical fixes automatically or manually (for specific) creates a service update (S++),
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which allowed only for consumers subscribed to the official support — purchased an actual package of the technical support.
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