{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "Duration",
  "type": "object",
  "additionalProperties": true,
  "description": "Version v1 - Duration.",
  "properties": {
    "start_time": {
      "type": "integer"
    },
    "end_time": {
      "type": "integer"
    }
  },
  "required": [
    "start_time",
    "end_time"
  ]
}