{
  "$id": "PitchOutline.json",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "corners": {
      "type": "array",
      "prefixItems": [
        {
          "$ref": "Position.json"
        },
        {
          "$ref": "Position.json"
        }
      ],
      "items": false,
      "minItems": 2,
      "maxItems": 2,
      "description": "The corners at the two ends of one touchline."
    },
    "centre": {
      "description": "The centre spot.",
      "$ref": "Position.json"
    },
    "by": {
      "type": "string",
      "enum": [
        "referee",
        "corners",
        "auto"
      ],
      "description": "Marked by the referee on the map, from corners walked on the watch (TRK-13), or found automatically."
    }
  },
  "required": [
    "corners",
    "centre",
    "by"
  ],
  "additionalProperties": false,
  "description": "Where the pitch is and which way it lies, for heatmaps (TRK-9)."
}