{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://rig.works/schemas/rig.paper.identifier.schema.json",
  "title": "rig.paper.identifier",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "doi": {
      "$ref": "./_defs.schema.json#/$defs/string"
    },
    "pmid": {
      "type": "string",
      "pattern": "^[0-9]+$",
      "description": "PubMed PMID."
    },
    "pmcid": {
      "type": "string",
      "pattern": "^PMC[0-9]+$",
      "description": "PubMed Central PMCID."
    },
    "arxiv": {
      "$ref": "./_defs.schema.json#/$defs/string"
    }
  },
  "description": "Article identifiers. Field meanings follow JATS article-id and Crossref. Prefer doi when present.",
  "minProperties": 1
}