OpenAPI 3.1 $ref inside and outside schema objects

openapi31.yaml

openapi: 3.1.0
info:
  title: My API
  version: 1.0.0
paths:
  /things:
    post:
      parameters:
        - $ref: '#/components/parameters/type'
          description: The type of the thing to submit # only summary and description are effective here, they override any inside the $ref
      requestBody:
        required: true
        content:
          'application/json':
            schema:
              $ref: '#/components/schemas/thing'
              required:
                - name
      responses:
        '200':
          description: OK
          content:
            'application/json':
              schema:
                $ref: '#/components/schemas/thing'
                required: # all constraints within and outside the $ref must validate
                  - id
                  - name
                description: The new thing being returned including its id # all annotations within and outside the $ref are collected (not merged or overridden)
components:
  schemas:
    thing:
      description: Generic description of a thing with no required properties
      type: object
      properties:
        id:
          type: integer
        name:
          type: string
 parameters:
   type:
     description: Generic description of a type parameter
     name: type
     in: query
     schema:
       type: string