{
  "id": "hydra",
  "acronym": "HYDRA",
  "name": "The Hydra Core Vocabulary",
  "category": "metadata",
  "domains": [
    "chemistry",
    "computing",
    "health",
    "earth"
  ],
  "kind": "vocabulary",
  "description": "The Hydra repository was a digital archive for the University of Hull. It was developed to hold, manage, preserve and provide access to the growing body of digital material generated through the research, teaching and administrative activities of the University.",
  "formats": [
    "RDF"
  ],
  "license": "CC BY 4.0",
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  "bioregistry": "hydra",
  "registryStats": {
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      "reusedByDatasets": 0,
      "occurrencesInDatasets": 0,
      "modified": "2015-01-11",
      "namespace": "http://www.w3.org/ns/hydra/core#"
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      "triples": 469,
      "titleFrom": "artefact"
    }
  },
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  "usedBy": [],
  "tags": [
    "business administration",
    "chemistry",
    "clinical psychology",
    "computer science",
    "education science",
    "engineering science",
    "event",
    "geography"
  ],
  "url": "https://schemascope.org/o/hydra/",
  "evaluation": {
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        "code": 200,
        "state": "ok",
        "resolvedUrl": "https://www.hydra-cg.com/spec/latest/core/",
        "lastModified": "2021-07-13T20:26:07.000Z",
        "checkedAt": "2026-10-26T02:59:47.592Z"
      },
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      "download": {
        "url": "https://lov.linkeddata.es/dataset/lov/vocabs/hydra/versions/2015-01-11.n3",
        "code": 0,
        "state": "dead",
        "error": "fetch failed",
        "checkedAt": "2026-10-26T03:00:07.802Z"
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    "github": null,
    "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
    },
    "bioregistry": {
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      "name": "The Hydra Core Vocabulary",
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        "fairsharing": "FAIRsharing.1Uw3Q9",
        "lov": "hydra",
        "zazuko": "hydra"
      },
      "dependsOn": [],
      "appearsIn": [],
      "license": null,
      "version": null,
      "deprecated": false,
      "page": "https://bioregistry.io/hydra",
      "source": "https://bioregistry.io/api/registry/hydra",
      "fetchedAt": "2026-10-26T02:59:46.917Z"
    },
    "artifact": {
      "source": "https://lov.linkeddata.es/dataset/lov/vocabs/hydra/versions/2015-01-11.n3",
      "error": "fetch failed",
      "fetchedAt": "2026-10-26T02:59:57.305Z"
    },
    "score": 17,
    "gross": 22,
    "earned": 22,
    "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": 22,
    "breakdown": {
      "findable": {
        "score": 3,
        "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": 3,
            "max": 5,
            "detail": "2: Bioregistry, FAIRsharing"
          },
          {
            "label": "Citable reference (F2)",
            "pts": 0,
            "max": 3,
            "detail": "no reference publication listed"
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        "notes": [
          "Persistent identifier (F1): no PURL / w3id / DOI for the artefact",
          "Indexed in services (F4): 2: Bioregistry, FAIRsharing",
          "Citable reference (F2): no reference publication listed"
        ]
      },
      "accessible": {
        "score": 6,
        "max": 12,
        "steps": [
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            "label": "Homepage reachable",
            "pts": 3,
            "max": 3,
            "detail": "HTTP 200"
          },
          {
            "label": "Artefact retrievable over HTTP(S) (A1)",
            "pts": 0,
            "max": 6,
            "detail": "unreachable"
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          {
            "label": "Metadata persists in a registry (A2)",
            "pts": 3,
            "max": 3,
            "detail": "Bioregistry"
          }
        ],
        "notes": [
          "Artefact retrievable over HTTP(S) (A1): unreachable"
        ]
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      "interoperable": {
        "score": 8,
        "max": 12,
        "steps": [
          {
            "label": "Formal machine-readable format (I1)",
            "pts": 5,
            "max": 5,
            "detail": "RDF"
          },
          {
            "label": "Semantic-web IRIs (I2)",
            "pts": 3,
            "max": 3,
            "detail": "RDF"
          },
          {
            "label": "References other vocabularies (I3)",
            "pts": 0,
            "max": 4,
            "detail": "no imported vocabularies found"
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        "notes": [
          "References other vocabularies (I3): no imported vocabularies found"
        ]
      },
      "reusable": {
        "score": 5,
        "max": 12,
        "steps": [
          {
            "label": "Clear license (R1.1)",
            "pts": 5,
            "max": 5,
            "detail": "CC BY 4.0"
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          {
            "label": "Release provenance (R1.2)",
            "pts": 0,
            "max": 4,
            "detail": "no version in artefact, registry or release tags"
          },
          {
            "label": "Community standards (R1.3)",
            "pts": 0,
            "max": 3,
            "detail": "no independent compliance report (not on the OBO Dashboard)"
          }
        ],
        "notes": [
          "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)"
        ]
      },
      "quality": {
        "score": 0,
        "max": 20,
        "steps": [
          {
            "label": "Logical consistency",
            "pts": 0,
            "max": 10,
            "detail": "never checked by a reasoner"
          },
          {
            "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"
          },
          {
            "label": "Pitfall scan: no critical pitfalls",
            "pts": 0,
            "max": 1,
            "detail": "no pitfall scan or ROBOT report yet"
          }
        ],
        "notes": [
          "Logical consistency: never checked by a reasoner",
          "OWL 2 DL profile: profile not checked",
          "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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      "maintenance": {
        "score": 0,
        "max": 16,
        "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"
          }
        ],
        "notes": [
          "Recency: no activity evidence",
          "Release cadence (12 months): 0 releases"
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        "max": 16,
        "steps": [
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            "label": "Documented adopting projects",
            "pts": 0,
            "max": 7,
            "detail": "0 projects"
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          {
            "label": "Reused by other ontologies",
            "pts": 0,
            "max": 4,
            "detail": "0"
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          {
            "label": "Community signal",
            "pts": 0,
            "max": 5,
            "detail": "max(stars 0 → 0, citations 0 → 0)"
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        "notes": [
          "Documented adopting projects: 0 projects",
          "Reused by other ontologies: 0",
          "Community signal: max(stars 0 → 0, citations 0 → 0)"
        ]
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    "adopterCount": 0,
    "reuseCount": 0,
    "importCount": 0,
    "registries": [
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    "evaluatedVersion": null,
    "evaluatedAt": "2026-10-26T03:00:07.803Z",
    "runId": "2026-10-26T02-37-38Z",
    "adopters": []
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      "version": null,
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      "links": {
        "homepage": "ok",
        "download": "dead"
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        "registry": "Linked Open Vocabularies (LOV)",
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      "name": "Bioregistry",
      "description": "Bioregistry",
      "homepage": "Bioregistry",
      "tags": "Bioregistry",
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      "formats": "Linked Open Vocabularies (LOV)",
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