- des:
    yaml: |-
      yaml description
    ss: |-
     scheme description
  e.g.:
  - yaml: |-
      yaml e.g.
    ss: |-
      scheme e.g.

- des:
    yaml: |-
      documents
    ss: |-
      A procedure that can take a parameter.
      When the parameter is -1, return a list,
      which contains other yaml structure listed below
  e.g.:
  - yaml: |-
      --- 2
      ---
      ...
    ss: |-
      (lambda (...)
        (list 2 (list)))

- des:
    yaml: |-
      null
    ss: |-
      empty list
  e.g.:
  - yaml: |-
      null
    ss: |-
      (list)
  - yaml: |-
      ~
    ss: |-
      '()

- des:
    yaml: |-
      mapping
    ss: |-
      A list only contain 1 "association list"
  e.g.:
  - yaml: |-
      {key: value}
    ss: |-
      '((("key" . "value")))

- des:
    yaml: |-
      list
    ss: |-
      vector
  e.g.:
  - yaml: |-
      - 1
      - 2
      - 3
      - 4
      - []
    ss: |-
      (vector
      1
      2
      3
      4
      (vector))

- des:
    yaml: |-
      boolean
    ss: |-
      boolean
  e.g.:
  - yaml: |-
      true
    ss: |-
      #t
  - yaml: |-
      false
    ss: |-
      #f

- des:
    yaml: |-
      number
    ss: |-
      exact or inexact
  e.g.:
  - yaml: |-
      1
    ss: |-
      1
  - yaml: |-
      0.5
    ss: |-
      0.5
      (exact->inexact (/ 1 2))
  - yaml: |-
      0o10
    ss: |-
      8
  - yaml: |-
      0x10
    ss: |-
      16
  - yaml: |-
      10e1
    ss: |-
      100.0
  - yaml: |-
      3E2
    ss: |-
      300.0

- des:
    yaml: |-
      not a number
    ss: |-
      not a number
  e.g.:
  - yaml: |-
      .nan
    ss: |-
      +nan.0

- des:
    yaml: |-
      infinity
    ss: |-
      infinity
  e.g.:
  - yaml: |-
      +.inf
    ss: |-
      +inf.0
  - yaml: |-
      -.inf
    ss: |-
      -inf.0