{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "PolygonGeoJson",
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "coordinates": {
      "type": "array",
      "items": {
        "type": "array",
        "items": {
          "type": "array",
          "description": "an array of [long, lat]",
          "items": {
            "type": "number",
            "format": "double"
          }
        }
      }
    }
  }
}