openapi: 3.0.1
info:
  title: Circular Schema
  version: v1
paths:
  /test:
    post:
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/circular1'
components:
  schemas:
    circular1:
      type: object
      properties:
        children:
          type: array
          items:
            $ref: '#/components/schemas/circular1'
    circular2:
      oneOf:
       - $ref: '#/components/schemas/circular2'
    circular3:
      oneOf:
        - $ref: '#/components/schemas/circular2'
    circular4:
      oneOf:
        - oneOf:
          - $ref: '#/components/schemas/circular4'
    circular5:
      oneOf:
        - $ref: '#/components/schemas/circular1'
    circular6:
      oneOf:
        - $ref: '#/components/schemas/circular6'
        - $ref: '#/components/schemas/circular1'