Versioning policy
How Skolkoll versions, archives and licenses data — and how to cite it.
Date-based versioning
Skolkoll collects data from multiple open data sources with known update frequencies (see data sources). Each time a data source is updated the previous version is archived with a timestamp. The data shown on the site is always the latest collected version.
- Skolverket's school unit register is synced daily.
- The statistics database (PxWeb) is synced on the 1st and 15th of each month.
- SCB and Kolada are synced monthly.
Archival
Older versions are retained and pruned automatically. There is no
guarantee that all historical versions of a dataset remain available.
Archived versions are named with timestamps (e.g.
data/archive/v-2026-03-01T12-00-00-000Z/).
Citing data
Data and analyses from Skolkoll may be freely cited with attribution. Suggested format:
Skolkoll, "Merit value year 9", retrieved 2026-04-04
URL: https://skolkoll.se/en/statistics/merit-grundskola/
Source: Skolverket Statistics Database (SIRIS)Always include the retrieval date so the reader knows which data version you are referring to. See also the citation guide.
Schema changes
- New fields are added without removing existing ones (additive schema).
- Fields to be removed are marked
deprecatedfor at least one version before removal. - All schema changes are documented in the changelog.
Licence
- Skolkoll compilations: CC BY 4.0
- Source data: Each data source's own licence — Skolverket, SCB, Kolada etc. publish open data under their own terms.