json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "id": "http://schema.envirocar.org/terms-of-use-instance.json#",
      "properties": {
          "contents": {
              "type": "string"
          },
          "created": {
              "_format": "date-time",
              "type": "string"
          },
          "id": {
              "type": "string"
          },
          "issuedDate": {
              "_format": "date",
              "type": "string"
          },
          "modified": {
              "_format": "date-time",
              "type": "string"
          }
      },
      "required": [
          "id",
          "issuedDate",
          "contents"
      ],
      "type": "object"
  }