.sd
1 claimant
1 primary
0 secondary
unambiguous primary
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.
141.9K
total files
65.3K
first seen 2021–2025 (46.0%)
2020
median year (half its files since)
Case variants in archive: .sd (139.9K), .SD (1.6K), .Sd (174), .sD (157) — aggregated above.
Attribution status
This extension is attributed to Vespa Schema Definition as primary by 1 authoritative claim.
Authoritative sources: ✓ Linguist ✗ Pygments · no claim ✗ Wikidata · no claim ✗ Wikipedia · no claim
Claimants (1)
Languages that list
.sd among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| Vespa Schema Definition | linguist | primary |
Wikidata says… (5)
File formats, image formats, audio codecs and other non-PL
entities that claim
.sd 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 |
|---|---|---|---|---|---|
| MDL Molfile Q3841253 file format in chemistry | file format | — | chemical/x-mdl-molfile | wp-only | Use as new PL ↗ |
| Structure-data file Q28530510 file format for atomic coordinates, chemical bond information, and metadata | file format | — | chemical/x-mdl-sdfile | wp-only | Use as new PL ↗ |
| TIFF Q215106 series of image file formats | file format family | — | image/tiff | wp-only | Use as new PL ↗ |
Disambiguation rules (1)
Linguist heuristics that decide, by content, which language a
.sd file actually is.| Rule | Predicts | Kind | Predicates (truncated) | Measured on SWH |
|---|---|---|---|---|
h/linguist/.sd/0 | Vespa Schema Definition | predicates | [{"kind": "any", "regexes": ["^[ \\t]*(?:schema|search|document)[ \\t]+[\\w.\\/-]+[ \\t]*(?:inherits[ \\t][^{\\n]*)?\\{"]}] |
SWH-mined examples (0)
No archived examples for .sd in our local mirror yet.