{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schema.govfresh.com/v1/_core/identifier.schema.json",
  "title": "Identifier",
  "description": "A scheme-qualified identifier.",
  "standards": [
    "ocds",
    "wikidata",
    "open-civic-data"
  ],
  "type": "object",
  "properties": {
    "@type": {
      "const": "PropertyValue",
      "description": "Always `PropertyValue`, where `propertyID` names the scheme and `value` carries the code. This is the mechanism that makes the model work internationally: no national identifier system is privileged, and an entity may carry as many as it has. The same pattern is used by OCDS for organization identifiers."
    },
    "propertyID": {
      "type": "string",
      "description": "The identifier scheme. Use a registered token below, an 'org-id:<prefix>' token from the org-id.guide register, 'local:<scheme>' for a publisher's own internal register (distinct from org-id: so that provenance is never overstated), or an absolute IRI.",
      "anyOf": [
        {
          "enum": [
            "wikidata",
            "iso3166-1-alpha2",
            "iso3166-1-alpha3",
            "iso3166-2",
            "geonames",
            "lei",
            "ocd-division",
            "gs:local"
          ]
        },
        {
          "pattern": "^local:[A-Za-z0-9._-]+$"
        },
        {
          "pattern": "^org-id:[A-Z]{2}-[A-Z0-9]+$"
        },
        {
          "format": "iri"
        }
      ]
    },
    "value": {
      "type": "string",
      "minLength": 1,
      "description": "The identifier's actual code or value."
    },
    "name": {
      "type": "string",
      "description": "Human-readable name of the scheme."
    }
  },
  "required": [
    "@type",
    "propertyID",
    "value"
  ],
  "additionalProperties": false
}