{
  "swagger": "2.0",
  "info": {"title": "a $ref under a keyword the model does not map", "version": "1.0.0"},
  "paths": {
    "/things": {
      "get": {
        "responses": {
          "200": {"description": "a thing", "schema": {"$ref": "#/definitions/holder"}}
        }
      }
    }
  },
  "definitions": {"holder": {"$ref": "other.json#/definitions/deep"}}
}