{
  "type": "CityJSONExtension",
  "name": "Potato",
  "uri": "https://www.cityjson.org/extensions/download/potato.ext.json",
  "version": "1.0",
  "versionCityJSON": "2.0",
  "description": "Extension to handle massive potatoes in our cities",
  
  "extraRootProperties": {},     
  
  "extraAttributes": {},
  
  "extraSemanticSurfaces": {},

  "extraCityObjects": {
    "+Potato": {
      "allOf": [
        { "$ref": "cityobjects.schema.json#/_AbstractCityObject" },
        {
          "properties": {
            "type": { "enum": [ "+Potato" ] },
            "attributes": {
              "type": "object",
              "properties": {
                "my-attribute": { "type": "string" }
              }
            },
            "geometry": {
              "type": "array",
              "items": {
                "oneOf": [
                  { "$ref": "geomprimitives.schema.json#/MultiSurface" },
                  { "$ref": "geomprimitives.schema.json#/CompositeSurface" },
                  { "$ref": "geomprimitives.schema.json#/Solid" }
                ]
              }
            }
          },
          "required": [ "type" ]
        }
      ]
    }
  }
}