{
  "id": "ocn",
  "kind": "datatype",
  "status": "stable",
  "name": "OCLC Control Number",
  "doc": "OCLC assigns a unique control number (referred to as an \"OCN\" for \"OCLC Control Number\") to each new bibliographic record in the WorldCat. Numbers are assigned serially, and as of mid-2013 over a billion OCNs had been created. In September 2013, the OCLC declared these numbers to be in the public domain, removing a perceived barrier to widespread use of OCNs outside OCLC itself.[42] The control numbers link WorldCat's records to local library system records by providing a common reference key for a record across libraries",
  "is_pii": false,
  "categories": [
    "objectids"
  ],
  "langs": [
    "common"
  ],
  "classification": "identifier",
  "regexp": "\\d{1,14}",
  "examples": [
    {
      "value": "787911721",
      "description": "Directory of Open Access Books",
      "valid": true
    },
    {
      "value": "57722711",
      "description": "Iso suomen kielioppi",
      "valid": true
    }
  ],
  "mappings": {
    "bioregistry": "oclc",
    "wikidata": "P243"
  },
  "links": [
    {
      "type": "wikipedia",
      "url": "https://en.wikipedia.org/wiki/OCLC"
    },
    {
      "type": "wikidata",
      "url": "https://www.wikidata.org/wiki/Property:P243"
    }
  ],
  "quality": {
    "score": 70,
    "missing": [
      "anchored regexp",
      "negative example",
      "translation",
      "detector coverage"
    ]
  },
  "source": {
    "path": "data/datatypes/any/objectids/ocn.yaml",
    "url": "https://github.com/apicrafter/metacrafter-registry/blob/main/data/datatypes/any/objectids/ocn.yaml",
    "edit_url": "https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/any/objectids/ocn.yaml"
  },
  "urls": {
    "html": "http://registry.apicrafter.io/datatype/ocn",
    "json": "http://registry.apicrafter.io/api/v1/datatypes/ocn.json"
  }
}