Ontology

SKOS

Simple Knowledge Organization System

SKOS is an area of work developing specifications and standards to support the use of knowledge organization systems (KOS) such as thesauri, classification schemes, subject heading lists and taxonomies within the framework of the Semantic Web

computer sciencemiscellaneousontologyw3c rec
E21

FAIR 26/48

Version file of 2011-08-06

Evaluated 26 Oct 2026

How scores work

Source & access

Homepagew3.org DownloadCanonical file / PURL Browse in OLSEMBL-EBI Ontology Lookup Service

Portals & registries

SourceIDVersionClassesPropertiesIndividualsLoaded
OLS (EMBL-EBI)skos—656025 Oct 2026
TIB Terminology Serviceskos—53602 Feb 2023

Ontology IRI http://www.w3.org/2004/02/skos/core

Languages en

Reused by (98)
ADDICTO ADO AFO AfPO AISM BAO BCIO BMONT BSPO CARO CDNO CHEMINF CIDO CL CLO CMPO COVOC CPONT CTENO DCAT DOID DUO ECAO EFO EMAP EMI EMRO ENM ENVO EPIO EVORAO EXMO FOVT GALLONT GAZ GO GOLD HCAO HGNC hgnc.genegroup HRA HSO ICO ICTV IDOMAL biomodels.kisao MAMO MCRO METPO MFMO MIRO MONDO MSIO NBO NGBO NMR OHD OHMI OM OMO ONE ONS ONTOAVIDA ONTONEO OOSTT OPMI ORPHA ORTH PAIN PBPKO PCL PLANA PLANP PRIDE PROCO PSO RBO REHABO RO SCDO schema.org SCHEMAORG_HTTPS SEMAPV SEPIO SIO SLSO SNOMED CT SWO TADS biomodels.teddy TGMA TXPO uniprot.core UPHENO VBO VO WBbt XPO

Logical consistency (ROBOT ELK)
consistent · 0 unsatisfiable
ROBOT report
1 errors · 32 warnings

OOPS!: 0 critical · 2 important · 2 minor pitfall types

Also registered as
ols: skos tib.ts: skos

Automated evaluation

F Findable FAIR4/12
  • Persistent identifier (F1)no PURL / w3id / DOI for the artefact0
  • Indexed in services (F4)3: OLS, TIB, Bioregistry+4
  • Citable reference (F2)no reference publication listed0
A Accessible FAIR12/12
  • Homepage reachableHTTP 200+3
  • Artefact retrievable over HTTP(S) (A1)download HTTP 200+6
  • Metadata persists in a registry (A2)Bioregistry+3
I Interoperable FAIR8/12
  • Formal machine-readable format (I1)OWL, RDF+5
  • Semantic-web IRIs (I2)OWL, RDF+3
  • References other vocabularies (I3)no imported vocabularies found0
R Reusable FAIR2/12
  • Clear license (R1.1)W3C-2023 (not a recognised open license)+2
  • Release provenance (R1.2)no version in artefact, registry or release tags0
  • Community standards (R1.3)no independent compliance report (not on the OBO Dashboard)0
Q Ontology consistency & quality11/20
  • Logical consistencyconsistent, 0 unsatisfiable classes (ROBOT ELK in SchemaScope CI)+10
  • OWL 2 DL profileoutside OWL 2 DL0
  • Upper-ontology alignmentno BFO/COB/DOLCE import found0
  • Standard relations (RO)does not import the Relation Ontology0
  • ROBOT report: no errors1 errors0
  • ROBOT report: warning density32 warnings / 6 classes = 5.330
  • Pitfall scan: no critical pitfalls0 critical, 2 important, 2 minor pitfall types (OOPS! (local Docker))+1
M Maintenance0/16
  • Recency2011-08-06 → 182.6 months (older / unknown)0
  • Release cadence (12 months)0 releases0
U Community adoption4/16
  • Documented adopting projects0 projects0
  • Reused by other ontologies122 vocabularies (LOV)+4
  • Community signalmax(stars 0 → 0, citations 0 → 0)0
P Penalties (inactivity & inconsistency)-20
  • Time since last activity15.2 years → 4 × max(0, 15.2 − 1) (capped)-20
  • Inactive statusnot archived, legacy or inactive0
  • Consistencyconsistent, no unsatisfiable classes0
  • ROBOT report errors1 errors against OBO conventions; not penalised (not an OBO-style ontology)0

FAIR subtotal 26/48 · earned 41/100 − 20 inactivity = 21/100 → grade E

Community adoption 0

No adopting projects documented yet.

Know a project that uses SKOS? Suggest it.

History & changes 1 run

History starts with the first archived run; changes appear after the next evaluation.

RunScoreFAIRVersion evaluatedTermsSnapshot
26 Oct 2026, 03:31 UTC21 E26file of 2011-08-066JSON

Provenance

Every fact on this page was fetched automatically. Each row shows where it came from and when. If a source fails, the last good value is kept and marked “carried forward”.

FactSourceRetrieved
Homepage link check (HTTP 200)w3.org26 Oct 2026, 03:22 UTC
Download link check (HTTP 200)w3.org26 Oct 2026, 03:22 UTC
Artefact headerw3.org26 Oct 2026, 03:22 UTC
OLS classes, imports, version & releaseebi.ac.uk26 Oct 2026, 03:22 UTC
TIB Terminology Service metricsservice.tib.eu26 Oct 2026, 03:22 UTC
Bioregistry mappings, dependencies & reusebioregistry.io26 Oct 2026, 03:22 UTC
ROBOT reason/report in SchemaScope CI—25 Oct 2026, 21:55 UTC
OOPS! pitfall scanoops.linkeddata.es25 Oct 2026, 21:55 UTC

Run 2026-10-26T02-37-38Z · evaluator v2.0.0 · rubric v3.4 · entry.json · run snapshot