%YAML 1.1
---
!!map {
  ? !!str "block styles" : !!map {
    ? !!str "scalars" : !!map {
      ? !!str "literal"
      : !!str "#!/usr/bin/perl\n\
          print \"Hello,
          world!\\n\";\n",
      ? !!str "folded"
      : !!str "This sentence
          is false.\n"
    },
    ? !!str "collections" : !!map {
      ? !!str "sequence" : !!seq [
        !!str "entry",
        !!map {
          ? !!str "key" : !!str "value"
        }
      ],
      ? !!str "mapping" : !!map {
        ? !!str "key" : !!str "value"
} } } }