{
    "jsonSchema": {
        "title": "A localisation form",
        "type": "object",
        "required": [
          "lat",
          "lon"
        ],
        "properties": {
          "lat": {
            "type": "number"
          },
          "lon": {
            "type": "number"
          }
        }
      },
      "uiSchema": {
        "ui:field": "geo"
      },
      "formData": {
        "lat": 0,
        "lon": 0
      }
}