---
top1: &node1
  &k1 key1: one
top2: &node2 # comment
  key2: two
top3:
  &k3 key3: three
top4:
  &node4
  &k4 key4: four
top5:
  &node5
  key5: five
top6: &val6
  six
top7:
  &val7 seven