{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "/",
  "type": "object",
  "properties": {
    "when": {
      "id": "when",
      "type": "string"
    },
    "url": {
      "id": "url",
      "type": "string"
    },
    "name": {
      "id": "name",
      "type": "string"
    }
  },
  "additionalProperties": true,
  "required": [
    "when",
    "url",
    "name"
  ]
}