.csl
3 claimants
2 primary
1 secondary
shared primary (2)
SWH popularity
Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.
228.9K
total files
64.2K
first seen 2021–2025 (28.0%)
2017
median year (half its files since)
Case variants in archive: .csl (228.7K), .CSL (203), .Csl (1), .csL (1) — aggregated above.
Attribution status
This extension is attributed to csl; KQL as primary by 2 authoritative claims.
Authoritative sources: ✓ Linguist △ Pygments · secondary ✓ Wikidata · Q824708 ✗ Wikipedia · no claim
Claimants (4)
Languages that list
.csl among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| csl | wikidata | primary |
| KQL | linguist | primary |
| KQL | pygments | secondary |
| xml | linguist | secondary |
Wikidata says… (3)
File formats, image formats, audio codecs and other non-PL
entities that claim
.csl on Wikidata
(property P1195) or in the Wikipedia infobox.
Source: data/derived/external_extension_index.csv.
Click Use as new PL on any row to open the
Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata
URL, and this extension — one submission creates the PL + claim.
| Format | Class (Wikidata P31) | Suggested label | MIME | Notes | Action |
|---|---|---|---|---|---|
| Citation Style Language Q824708 open XML-based language | file format; XML-based format | data:xml-like | application/vnd.citationstyles.style+xml | — | Use as new PL ↗ |
| Calamus textStyle List Q105850263 file format | file format | — | application/octet-stream | — | Use as new PL ↗ |
| CorelDRAW Document Q939636 file format family | file format; file format family | — | — | — | Use as new PL ↗ |
Disambiguation rules (2)
Linguist heuristics that decide, by content, which language a
.csl file actually is.| Rule | Predicts | Kind | Predicates (truncated) | Measured on SWH |
|---|---|---|---|---|
h/linguist/.csl/0 | xml | predicates | [{"kind": "any", "regexes": ["(?i:^\\s*(<\\?xml|xmlns))"]}] | |
h/linguist/.csl/1 | KQL | predicates | [{"kind": "any", "regexes": ["(^\\|\\s*(where|extend|project|limit|summarize))|(^\\.\\w+)"]}] |
SWH-mined examples (0)
No archived examples for .csl in our local mirror yet.