@type t() :: %SBoM.CycloneDX.V13.ExternalReference{
  __unknown_fields__: [Protobuf.unknown_field()],
  comment: String.t() | nil,
  hashes: [SBoM.CycloneDX.V13.Hash.t()],
  type: SBoM.CycloneDX.V13.ExternalReferenceType.t(),
  url: String.t()
}