{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "properties": {
    "created": {
      "type": "string"
    },
    "author": {
      "type": "string"
    },
    "created_by": {
      "type": "string"
    },
    "comment": {
      "type": "string"
    },
    "empty_layer": {
      "type": "boolean"
    }
  },
  "required": [
  ]
}
