Ontology

CTO

Clinical Trials Ontology

The core Ontology of Clinical Trials (CTO) will serve as a structured resource integrating basic terms and concepts in the context of clinical trials. Thereby covering clinicaltrails.gov. CoreCTO will serve as a basic ontology to generate extended versions for specific applications such as annotation of variables in study documents from clinical trials.

biomedical sciencediseaseneurobiologyoboontologypreclinical studies
E39

FAIR 34/48

Version commit d5a3f8a

Evaluated 26 Oct 2026

How scores work

Source & access

Homepagegithub.com Repositorygithub.com DownloadCanonical file / PURL Browse in BioPortalNCBO BioPortalBrowse in OBO FoundryOBO Foundry registry

Portals & registries

SourceIDVersionClassesPropertiesIndividualsLoaded
OBO Dashboardcto—128———
Logical consistency
consistent · 0 unsatisfiable
OWL 2 DL
no
ROBOT report
—
OBO principles
Axioms
718 · 33.73% entities reused

Also registered as
aberowl: CTO bioportal: CTO fairsharing: FAIRsharing.qp211a obofoundry: cto ontobee: CTO wikidata.entity: Q113009139

Automated evaluation

F Findable FAIR9/12
  • Persistent identifier (F1)purl.obolibrary.org+4
  • Indexed in services (F4)4: BioPortal, OBO Foundry, Bioregistry, FAIRsharing+5
  • 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)OBO Foundry, Bioregistry+3
I Interoperable FAIR8/12
  • Formal machine-readable format (I1)OWL+5
  • Semantic-web IRIs (I2)OWL+3
  • References other vocabularies (I3)no imported vocabularies found0
R Reusable FAIR5/12
  • Clear license (R1.1)CC BY 4.0+5
  • Release provenance (R1.2)no version in artefact, registry or release tags0
  • Community standards (R1.3)OBO principles: 0/0 checks pass0
Q Ontology consistency & quality10/20
  • Logical consistencyconsistent, 0 unsatisfiable classes (OBO Dashboard)+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 errorsno ROBOT report available0
  • ROBOT report: warning densityno ROBOT report available0
  • Pitfall scan: no critical pitfallsno pitfall scan or ROBOT report yet0
M Maintenance0/16
  • Recency2024-05-31 → 28.8 months (older / unknown)0
  • Release cadence (12 months)0 releases0
U Community adoption1/16
  • Documented adopting projects0 projects0
  • Reused by other ontologies00
  • Community signalmax(stars 14 → 1, citations 0 → 0)+1
P Penalties (inactivity & inconsistency)-6
  • Time since last activity2.4 years → 4 × max(0, 2.4 − 1)-6
  • Inactive statusnot archived, legacy or inactive0
  • Consistencyconsistent, no unsatisfiable classes0

FAIR subtotal 34/48 · earned 45/100 − 6 inactivity = 39/100 → grade E

Community adoption 0

No adopting projects documented yet.

Know a project that uses CTO? 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 UTC39 E34commit d5a3f8a—JSON

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, 02:48 UTC
Repository link check (HTTP 200)github.com26 Oct 2026, 02:48 UTC
Download link check (HTTP 200)purl.obolibrary.org26 Oct 2026, 02:48 UTC
Artefact headerraw.githubusercontent.com26 Oct 2026, 02:48 UTC
Git refs (commit d5a3f8a)github.com26 Oct 2026, 02:48 UTC
GitHub repository statisticsapi.github.com26 Oct 2026, 02:48 UTC
OBO Foundry status, license & usagesobofoundry.org26 Oct 2026, 02:37 UTC
Bioregistry mappings, dependencies & reusebioregistry.io26 Oct 2026, 02:48 UTC
OBO Dashboard (checked —)dashboard.obofoundry.org26 Oct 2026, 02:37 UTC

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