Vocabulary

FOAF

Friend of a Friend

FOAF is a project devoted to linking people and information using the Web. Regardless of whether information is in people's heads, in physical or digital documents, or in the form of factual data, it can be linked. FOAF integrates three kinds of network: social networks of human collaboration, friendship and association; representational networks that describe a simplified view of a cartoon universe in factual terms, and information networks that use Web-based linking to share independently published descriptions of this inter-connected world.

digital planning and constructionessfid baudigitalnfdi4ingontologypeople
E35

FAIR 26/48

Version file of 2026-01-23

Evaluated 26 Oct 2026

How scores work

Source & access

Homepagexmlns.com DownloadCanonical file / PURL Browse in BioPortalNCBO BioPortal

Portals & registries

SourceIDVersionClassesPropertiesIndividualsLoaded
TIB Terminology Servicefoaf—217103 Apr 2024
Logical consistency (ROBOT ELK)
—

Also registered as
aberowl: FOAF bioportal: FOAF tib.ts: foaf

Automated evaluation

F Findable FAIR4/12
  • Persistent identifier (F1)no PURL / w3id / DOI for the artefact0
  • Indexed in services (F4)3: TIB, BioPortal, Bioregistry+4
  • Citable reference (F2)no reference publication listed0
A Accessible FAIR9/12
  • Homepage reachableHTTP fetch failed0
  • 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)RDF, JSON-LD+5
  • Semantic-web IRIs (I2)RDF, JSON-LD+3
  • References other vocabularies (I3)no imported vocabularies found0
R Reusable FAIR5/12
  • Clear license (R1.1)CC-BY-1.0+5
  • 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 & quality0/20
  • Logical consistencynever checked by a reasoner0
  • 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 Maintenance5/16
  • Recency2026-01-23 → 9.0 months (≤ 1 year)+5
  • Release cadence (12 months)0 releases0
U Community adoption4/16
  • Documented adopting projects0 projects0
  • Reused by other ontologies318 vocabularies (LOV)+4
  • Community signalmax(stars 0 → 0, citations 0 → 0)0
P Penalties (inactivity & inconsistency)0
  • Time since last activity0.8 years → 4 × max(0, 0.8 − 1)0
  • Inactive statusnot archived, legacy or inactive0
  • Consistencynot yet checked by a reasoner0

FAIR subtotal 26/48 · earned 35/100 = 35/100 → grade E

Community adoption 0

No adopting projects documented yet.

Know a project that uses FOAF? 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 UTC35 E26file of 2026-01-23—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 fetch failed)xmlns.com26 Oct 2026, 02:56 UTC
Download link check (HTTP 200)xmlns.com26 Oct 2026, 02:55 UTC
Artefact headerxmlns.com26 Oct 2026, 02:55 UTC
TIB Terminology Service metricsservice.tib.eu26 Oct 2026, 02:56 UTC
Bioregistry mappings, dependencies & reusebioregistry.io26 Oct 2026, 02:55 UTC
ROBOT reason/report in SchemaScope CI—25 Oct 2026, 21:55 UTC

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