digraph G {
  {
    imageIndex [shape=note, label="Image Index\n<<optional>>\napplication/vnd.oci.image.index.v1+json"]
    manifest [shape=note, label="Image manifest\napplication/vnd.oci.image.manifest.v1+json"]
    config [shape=note, label="Image JSON\napplication/vnd.oci.image.config.v1+json"]
    layer [shape=note, label="Layer tar archive\napplication/vnd.oci.image.layer.v1.tar\napplication/vnd.oci.image.layer.v1.tar+gzip\napplication/vnd.oci.image.layer.nondistributable.v1.tar\napplication/vnd.oci.image.layer.nondistributable.v1.tar+gzip"]
  }

  imageIndex -> manifest [label="1..*"]
  manifest -> config [label="1..1"]
  manifest -> layer [label="1..*"]
}