text: myweb:
    extends:
      file: specify-file-as-self.yml
      service: web
    environment:
      - "BAR=1"
  web:
    extends:
      file: specify-file-as-self.yml
      service: otherweb
    image: busybox
    environment:
      - "BAZ=3"
  otherweb:
    image: busybox
    environment:
      - "YEP=1"
  