json_schema: {
      "id": "http://schemas.wbeme.com/json-schema/eme/accounts/mixin/account-ref/1-0-0.json#",
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
          "account_id": {
              "type": "string",
              "pattern": "^[\\w\\/\\.:-]+$",
              "description": "The EME account that this message is associated with.",
              "pbj": {
                  "type": "identifier",
                  "rule": "single"
              }
          }
      },
      "additionalProperties": true
  }