Ontology

IAO

Information Artifact Ontology

An ontology of information entities, originally driven by work by the Ontology of Biomedical Investigation (OBI) digital entity and realizable information entity branch.

assaybiomedical sciencedata identity and mappingdrug reportexperimental measurementfair data spacesnfdi-matwerknfdi4chem
B76

FAIR 48/48

Version 2026-03-30

Evaluated 26 Oct 2026

How scores work

Source & access

Homepagegithub.com Repositorygithub.com DownloadCanonical file / PURL Browse in OLSEMBL-EBI Ontology Lookup ServiceBrowse in BioPortalNCBO BioPortalBrowse in OBO FoundryOBO Foundry registry

Portals & registries

SourceIDVersionClassesPropertiesIndividualsLoaded
OLS (EMBL-EBI)iao2026-03-302661502125 Oct 2026
TIB Terminology Serviceiao2022-11-072631292021 Aug 2023
OBO Dashboardiao2026-03-30232——8 May 2026

Ontology IRI http://purl.obolibrary.org/obo/iao.owl
Version IRI http://purl.obolibrary.org/obo/iao/2026-03-30/iao.owl

Languages en

Imports from (8)
APOLLO_SV BFO COB OBI OMO PATO RO UO

Reused by (246)
ADDICTO ADO AEO AFO AfPO AGRO AIO AISM AMPHX APO APOLLO_SV ARO BAO BCGO BCIO BCO BFO BMONT BSPO BTO CAO CARO CDAO CDNO CEPH CHEBI CHEMINF CHIRO CHMO CIDO CIO CL CLAO CLO CLYH CMO CMPO COB COHO COLAO COVOC CPONT CREDIT CRO CRYOEM CTENO CVDO DDANAT DDPHENO DIDEO DISDRIV DOID DPO DRON DUO EC ECAO ECO ECOCORE ECTO EFO EHDAA2 EMAPA EMRO ENM ENSEMBLGLOSSARY ENVO EPIO EUPATH EXMO ExO FAO FBbi FBbt FBcv FBdv FIDEO FLOPO FOBI FOODON FOVT FYPO GALLONT GAZ GECKO GENEPIO GENO GEOGEO GMHO GNO GO GSSO HANCESTRO HAO HCAO HGNC HOM HP HRA HsapDv HSO HTN ICEO ICO ICTV IDO IDOCOVID19 IDOMAL INO LABO LEPAO LIFESTYLEFACTORS MA MAXO MCO MCRO MESH METPO MF MFMO MFOEM MFOMD MI MIAPA MICRO MIRO MMO MmusDv MOD MONDO MOP MP MPATH MPIO MRO MS MSIO NBO NCBITaxon NCIT NCRO NGBO NMR NOMEN OAE OARCS OBA OBCS OBI OBIB OCCO OGMS OGSF OHD OHMI OHPI oboInOwl OlatDv OMIABIS OMIT OMO OMP OMRSE ONE ONS ONTOAVIDA ONTONEO OOSTT OPL OPMI ORNASEQ OVAE PAIN PATO PBPKO PCL PCO PDRO PdumDv PECO PHIPO PLANA PLANP PO PORO PPO PR PREFER PRIDE PROCO PSDO PSO PW RBO REHABO REX RO ROR RS RXNO SCDO SEMAPV SEPIO SIBO SLM SLSO SO SPD SRAO STATO SWO SYMP T4FS TADS TAO TAXRANK TFO TGMA TO TRANS TTO TXPO UBERON UNIMOD UO UPA UPHENO VALUESETS VariO VBO VO VSAO VT VTO WBbt WBls WBPhenotype WIKIPATHWAYS XAO XCO XLMOD XPO ZECO ZFA ZFS ZP

Logical consistency
consistent · 0 unsatisfiable
OWL 2 DL
no
ROBOT report
0 errors · 30 warnings · 9 info
OBO principles
FP01FP02FP03FP04FP05FP06FP07FP08FP09FP11FP12FP16FP20
Axioms
2,671 · 15.88% entities reused

OOPS!: 2 critical · 2 important · 6 minor pitfall types

Also registered as
aberowl: IAO bioportal: IAO fairsharing: FAIRsharing.gq1xtx obofoundry: iao ols: iao ontobee: IAO tib.ts: iao wikidata.entity: Q55118415

Automated evaluation

F Findable FAIR12/12
  • Persistent identifier (F1)purl.obolibrary.org+4
  • Indexed in services (F4)6: OLS, TIB, BioPortal, OBO Foundry, Bioregistry, FAIRsharing+5
  • Citable reference (F2)doi:10.3233/978-1-61499-101-4-68+3
A Accessible FAIR12/12
  • Homepage reachableHTTP 200+3
  • Artefact retrievable over HTTP(S) (A1)download HTTP 200+6
  • Metadata persists in a registry (A2)OBO Foundry, Bioregistry+3
I Interoperable FAIR12/12
  • Formal machine-readable format (I1)OWL, OBO+5
  • Semantic-web IRIs (I2)OWL, OBO+3
  • References other vocabularies (I3)imports 8: apollo_sv, bfo, cob, obi, omo, pato, ro, uo+4
R Reusable FAIR12/12
  • Clear license (R1.1)CC BY 4.0+5
  • Release provenance (R1.2)2026-03-30 (version IRI in the artefact)+4
  • Community standards (R1.3)OBO principles: 11/13 checks pass+3
Q Ontology consistency & quality16/20
  • Logical consistencyconsistent, 0 unsatisfiable classes (OBO Dashboard)+10
  • OWL 2 DL profileoutside OWL 2 DL0
  • Upper-ontology alignmentimports BFO, COB+3
  • Standard relations (RO)imports RO+1
  • ROBOT report: no errors0 errors+2
  • ROBOT report: warning density30 warnings / 232 classes = 0.130
  • Pitfall scan: no critical pitfalls2 critical, 2 important, 6 minor pitfall types (OOPS! (local Docker))0
M Maintenance8/16
  • Recency2026-04-10 → 6.5 months (≤ 1 year)+5
  • Release cadence (12 months)2 releases (GitHub releases)+3
U Community adoption10/16
  • Documented adopting projects1 project+2
  • Reused by other ontologies246: addicto, ado, aeo, afo, afpo, agro…+4
  • Community signalmax(stars 115 → 4, citations 19 → 1)+4
P Penalties (inactivity & inconsistency)-6
  • Time since last activity0.5 years → 4 × max(0, 0.5 − 1)0
  • Inactive statusnot archived, legacy or inactive0
  • Consistencyconsistent, no unsatisfiable classes0
  • Critical pitfalls2 critical pitfall types (P19, P29) × 3-6

FAIR subtotal 48/48 · earned 82/100 − 6 inactivity = 76/100 → grade B

Community adoption 1

  • obofoundry.org

    IAO is used widely by multiple OBO ontologies for information representation.

    Source: OBO Foundry registry

Know a project that uses IAO? 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 UTC76 B482026-03-30266JSON

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)github.com26 Oct 2026, 02:59 UTC
Repository link check (HTTP 200)github.com26 Oct 2026, 02:59 UTC
Download link check (HTTP 200)purl.obolibrary.org26 Oct 2026, 02:59 UTC
Artefact header (version IRI)raw.githubusercontent.com26 Oct 2026, 02:59 UTC
Git refs (commit 3006aed, latest tag v2026-03-30)github.com26 Oct 2026, 02:59 UTC
GitHub repository statisticsapi.github.com26 Oct 2026, 02:59 UTC
OLS classes, imports, version & releaseebi.ac.uk26 Oct 2026, 02:59 UTC
OBO Foundry status, license & usagesobofoundry.org26 Oct 2026, 02:37 UTC
TIB Terminology Service metricsservice.tib.eu26 Oct 2026, 02:59 UTC
Bioregistry mappings, dependencies & reusebioregistry.io26 Oct 2026, 02:59 UTC
OBO Dashboard (checked 8 May 2026)dashboard.obofoundry.org26 Oct 2026, 02:37 UTC
OOPS! pitfall scanoops.linkeddata.es25 Oct 2026, 21:53 UTC
Crossref citations (doi:10.3233/978-1-61499-101-4-68)api.crossref.org26 Oct 2026, 02:59 UTC

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

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