json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "message": {
          "sub-id": {
              "type": "string",
              "pattern": "[0-9a-fA-F]{8}-([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}"
          },
          "topic": {
              "type": "string",
              "pattern": "^/[a-z\\-]+$"
          },
          "since": {
              "type": "number"
          },
          "snapshot": {
              "type": "boolean"
          },
          "filter": {
              "type": "string",
              "maxLength": 137,
              "pattern": "^[\\w\\-\\.#@\\*\\[\\]\\?]+$"
          }
      },
      "properties": {
          "message.sub-id": {
              "$ref": "#/message/sub-id"
          },
          "message.topic": {
              "$ref": "#/message/topic"
          },
          "message.since": {
              "$ref": "#/message/since"
          },
          "message.snapshot": {
              "$ref": "#/message/snapshot"
          },
          "message.filter": {
              "$ref": "#/message/filter"
          }
      },
      "required": [
          "message.sub-id",
          "message.topic",
          "message.since",
          "message.snapshot",
          "message.filter"
      ]
  }