Ontology

VOAF

Vocabulary of a Friend

VOAF is a vocabulary specification providing elements allowing the description of vocabularies (RDFS vocabularies or OWL ontologies) used in the Linked Data Cloud. In particular it provides properties expressing the different ways such vocabularies can rely on, extend, specify, annotate or otherwise link to each other. It relies itself on Dublin Core and voiD. The name of the vocabulary makes an explicit reference to FOAF because VOAF can be used to define networks of vocabularies in a way similar to the one FOAF is used to define networks of people.

metadataontology

FAIR 12/48

Evaluated 26 Oct 2026

How scores work

Source & access

Homepagepurl.org DownloadCanonical file / PURL

homepage purl.org HTTP fetch failed
download lov.linkeddata.es HTTP fetch failed

Automated evaluation

F Findable FAIR1/12

Persistent identifier (F1)no PURL / w3id / DOI for the artefact0
Indexed in services (F4)1: Bioregistry+1
Citable reference (F2)no reference publication listed0

A Accessible FAIR3/12

Homepage reachableHTTP fetch failed0
Artefact retrievable over HTTP(S) (A1)unreachable0
Metadata persists in a registry (A2)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 FAIR0/12

Clear license (R1.1)none found0
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 profileprofile not checked0
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

Recencyno activity evidence0
Release cadence (12 months)0 releases0

U Community adoption2/16

Documented adopting projects0 projects0
Reused by other ontologies6 vocabularies (LOV)+2
Community signalmax(stars 0 → 0, citations 0 → 0)0

P Penalties (inactivity & inconsistency)-5

No activity evidenceno commits, releases or dated files found-5
Inactive statusnot archived, legacy or inactive0
Consistencynot yet checked by a reasoner0

FAIR subtotal 12/48 · earned 14/100 − 5 inactivity = 9/100 → grade E

Community adoption 0

No adopting projects documented yet.

Know a project that uses VOAF? Suggest it.

History & changes 1 run

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

Run	Score	FAIR	Version evaluated	Terms	Snapshot
26 Oct 2026, 03:31 UTC	9 E	12	—	—	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”.

Fact	Source	Retrieved
Homepage link check (HTTP fetch failed)	purl.org	26 Oct 2026, 03:29 UTC
Download link check (HTTP fetch failed)	lov.linkeddata.es	26 Oct 2026, 03:29 UTC
Bioregistry mappings, dependencies & reuse	bioregistry.io	26 Oct 2026, 03:28 UTC

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