{
  "id": "voaf",
  "acronym": "VOAF",
  "name": "Vocabulary of a Friend",
  "category": "metadata",
  "kind": "ontology",
  "description": "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.",
  "formats": [
    "OWL"
  ],
  "homepage": "http://purl.org/vocommons/voaf",
  "download": "https://lov.linkeddata.es/vocommons/voaf/v2.3/voaf_v2.3.rdf",
  "bioregistry": "voaf",
  "registryStats": {
    "lov": {
      "reusedByVocabularies": 6,
      "reusedByDatasets": 2,
      "occurrencesInDatasets": 11,
      "modified": "2013-05-24",
      "namespace": "http://purl.org/vocommons/voaf#"
    }
  },
  "publications": [],
  "usedBy": [],
  "tags": [
    "metadata",
    "ontology"
  ],
  "url": "https://schemascope.org/o/voaf/",
  "evaluation": {
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        "code": 0,
        "state": "dead",
        "error": "fetch failed",
        "checkedAt": "2026-10-26T03:29:04.703Z"
      },
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        "code": 0,
        "state": "dead",
        "error": "fetch failed",
        "checkedAt": "2026-10-26T03:29:02.205Z"
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    "ols": null,
    "obo": null,
    "bioportal": null,
    "citations": [],
    "git": null,
    "tib": null,
    "dashboard": null,
    "quality": null,
    "oops": null,
    "releases": {
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      "lastYear": 0,
      "from": null
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      "name": "Vocabulary of a Friend",
      "mappings": {
        "lov": "voaf"
      },
      "dependsOn": [],
      "appearsIn": [],
      "license": null,
      "version": null,
      "deprecated": false,
      "page": "https://bioregistry.io/voaf",
      "source": "https://bioregistry.io/api/registry/voaf",
      "fetchedAt": "2026-10-26T03:28:41.248Z"
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      "error": "fetch failed",
      "fetchedAt": "2026-10-26T03:28:51.707Z"
    },
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    "gross": 14,
    "earned": 14,
    "possible": 100,
    "qualityApplies": true,
    "penalty": {
      "score": -5,
      "reason": "no commits, releases or dated files found",
      "steps": [
        {
          "label": "No activity evidence",
          "pts": -5,
          "detail": "no commits, releases or dated files found"
        },
        {
          "label": "Inactive status",
          "pts": 0,
          "detail": "not archived, legacy or inactive"
        },
        {
          "label": "Consistency",
          "pts": 0,
          "detail": "not yet checked by a reasoner"
        }
      ]
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    "consistent": null,
    "grade": "E",
    "fair": 12,
    "breakdown": {
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        "score": 1,
        "max": 12,
        "steps": [
          {
            "label": "Persistent identifier (F1)",
            "pts": 0,
            "max": 4,
            "detail": "no PURL / w3id / DOI for the artefact"
          },
          {
            "label": "Indexed in services (F4)",
            "pts": 1,
            "max": 5,
            "detail": "1: Bioregistry"
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          {
            "label": "Citable reference (F2)",
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            "max": 3,
            "detail": "no reference publication listed"
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          "Citable reference (F2): no reference publication listed"
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            "detail": "HTTP fetch failed"
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            "label": "Artefact retrievable over HTTP(S) (A1)",
            "pts": 0,
            "max": 6,
            "detail": "unreachable"
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            "label": "Metadata persists in a registry (A2)",
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            "max": 3,
            "detail": "Bioregistry"
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          "Homepage reachable: HTTP fetch failed",
          "Artefact retrievable over HTTP(S) (A1): unreachable"
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        "max": 12,
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            "label": "Formal machine-readable format (I1)",
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            "max": 5,
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            "label": "Semantic-web IRIs (I2)",
            "pts": 3,
            "max": 3,
            "detail": "OWL"
          },
          {
            "label": "References other vocabularies (I3)",
            "pts": 0,
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            "detail": "no imported vocabularies found"
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        ]
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        "max": 12,
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            "label": "Clear license (R1.1)",
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            "detail": "none found"
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            "label": "Release provenance (R1.2)",
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            "detail": "no version in artefact, registry or release tags"
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            "label": "Community standards (R1.3)",
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            "max": 3,
            "detail": "no independent compliance report (not on the OBO Dashboard)"
          }
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          "Clear license (R1.1): none found",
          "Release provenance (R1.2): no version in artefact, registry or release tags",
          "Community standards (R1.3): no independent compliance report (not on the OBO Dashboard)"
        ]
      },
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        "max": 20,
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            "label": "OWL 2 DL profile",
            "pts": 0,
            "max": 2,
            "detail": "profile not checked"
          },
          {
            "label": "Upper-ontology alignment",
            "pts": 0,
            "max": 3,
            "detail": "no BFO/COB/DOLCE import found"
          },
          {
            "label": "Standard relations (RO)",
            "pts": 0,
            "max": 1,
            "detail": "does not import the Relation Ontology"
          },
          {
            "label": "ROBOT report: no errors",
            "pts": 0,
            "max": 2,
            "detail": "no ROBOT report available"
          },
          {
            "label": "ROBOT report: warning density",
            "pts": 0,
            "max": 1,
            "detail": "no ROBOT report available"
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          {
            "label": "Pitfall scan: no critical pitfalls",
            "pts": 0,
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            "detail": "no pitfall scan or ROBOT report yet"
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          "Upper-ontology alignment: no BFO/COB/DOLCE import found",
          "Standard relations (RO): does not import the Relation Ontology",
          "ROBOT report: no errors: no ROBOT report available",
          "ROBOT report: warning density: no ROBOT report available",
          "Pitfall scan: no critical pitfalls: no pitfall scan or ROBOT report yet"
        ]
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        "steps": [
          {
            "label": "Recency",
            "pts": 0,
            "max": 10,
            "detail": "no activity evidence"
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            "label": "Release cadence (12 months)",
            "pts": 0,
            "max": 6,
            "detail": "0 releases"
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        ],
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          "Recency: no activity evidence",
          "Release cadence (12 months): 0 releases"
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        "max": 16,
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            "max": 4,
            "detail": "6 vocabularies (LOV)"
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            "detail": "max(stars 0 → 0, citations 0 → 0)"
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    "importCount": 0,
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