{
  "get": {
    "parameters": [
      {"$ref":  "../subdir.yaml#/components/parameters/Parameter.PetId"}
    ],
    "responses": {
      "200": {
        "description": "return a pet",
        "content": {
          "application/json": {
            "schema": {"$ref":  "../subdir/Pet.yaml"}
          }
        }
      }
    }
  }
}