yaml Getting started with yaml Block Style Mappings

Example

With implicit keys:

key: value
another key:
  - some
  - more
  - values
[1, 2, 3]: last value, which has a flow style key

---

With implicit and explicit keys:

? key
: value
another key:
  - some
  - more
  - values
? [1, 2, 3]
: last value, which has a flow style key

key, another key and [1, 2, 3] are keys of the same mapping, although they use different key styles.

---

Nested mappings:

first level:
  second level:
    ? third level
    :
      forth level: value of implicit key
    ? third level, second key
    : value of explicit key
  ?
    mapping as: key of
    another: mapping
  : scalar value of mapping key
first level, second key:
  last value