MSON to JSON-Schema "One of" issue - json

Question

I'm try to describe in ApiBlueprint MSON notation an object with variable part.
Here the simple code in ApiBlueprint :
FORMAT: 1A
# Test API
## Services [/Service/{id}]
### GET Service info [GET]
+ Request (application/json)
+ Headers
Authorization: JWT <token>
+ Response 200 (application/json)
+ Attributes (array[ServiceResource], fixed)
# Data Structures
## Resource (object)
### Properties
+ id: `a6vhAo3FG` (string, fixed)
+ created_at: `2016-07-01T15:11:09.553Z` (string, required)
+ updated_at: `2017-11-22T08:07:55.002Z` (string, required)
## Service (object)
### Properties
+ type: tcp_service (string, required)
- One Of
- config (TcpService, required)
- config (IcmpService, required)
## ServiceResource (Resource)
### Properties
- Include Service
## TcpService (object)
### Properties
+ port: `80` (number, required)
+ request_str: `HEAD` (string, required)
+ expect_response_str: `200 OK` (string, required)
## IcmpService (object)
### Properties
+ timeout_ms: `1000` (number, required)
+ packet_size_bytes: `1000` (number, required)
+ ttl: `128` (number, required)
It renders perfectly in apiary.io but validation of generated Json Schema in https://json-schema-validator.herokuapp.com reports an error:
[ {
"level" : "error",
"schema" : {
"loadingURI" : "#",
"pointer" : "/items"
},
"instance" : {
"pointer" : "/0"
},
"domain" : "validation",
"keyword" : "additionalProperties",
"message" : "object instance has properties which are not allowed by the schema: [\"config\"]",
"unwanted" : [ "config" ]
} ]
Maybe I'm doing something wrong?
Is there any way to discribe in MSON the array of objects where the object has a variant part which gives correct JSON Schema?

Answer 1

I believe you are looking for the fixed-type type attribute. fixed would mean that the values are fixed and cannot be anything other than the provided example value. When you used fixed-type you are indicating that the type is fixed, but the values are not.
+ Attributes (array[ServiceResource], fixed-type)