resources/pyyaml/spec-06-01.canonical

%YAML 1.1
---
!!map {
  ? !!str "Not indented"
  : !!map {
      ? !!str "By one space"
      : !!str "By four\n  spaces\n",
      ? !!str "Flow style"
      : !!seq [
          !!str "By two",
          !!str "Also by two",
          !!str "Still by two",
        ]
    }
}