b.yaml

openapi: "3.0.0"
info:
  version: 1.0.0
  title: Swagger Petstore
servers:
  - url: http://petstore.swagger.io/v1
  - url: http://{x}variable.path/{y}/{openVariable1}/{openVariable2}
    variables:
      x:
        default: a
        enum:
          - b
          - c
      y:
        default: aa
        enum:
          - a
          - aa
          - aaa
          - bbb
      openVariable1:
        default: henlo
      openVariable2:
        default: henlo
        enum:
          - a
          - aaa
paths:
  /pets:
    get:
      responses:
        "200":
          description: A paged array of pets
components: {}