================================================================================
Example 10.4. !!null Examples
================================================================================
!!null null: value for null key
key with null value: !!null null

--------------------------------------------------------------------------------

(stream
  (document
    (block_node
      (block_mapping
        (block_mapping_pair
          key: (flow_node
            (tag)
            (plain_scalar
              (null_scalar)))
          value: (flow_node
            (plain_scalar
              (string_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (null_scalar))))))))

================================================================================
Example 10.5. !!bool Examples
================================================================================
YAML is a superset of JSON: !!bool true
Pluto is a planet: !!bool false

--------------------------------------------------------------------------------

(stream
  (document
    (block_node
      (block_mapping
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (boolean_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (boolean_scalar))))))))

================================================================================
Example 10.6. !!int Examples
================================================================================
negative: !!int -12
zero: !!int 0
positive: !!int 34

--------------------------------------------------------------------------------

(stream
  (document
    (block_node
      (block_mapping
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (integer_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (integer_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (integer_scalar))))))))

================================================================================
Example 10.7. !!float Examples
================================================================================
negative: !!float -1
zero: !!float 0
positive: !!float 2.3e4
infinity: !!float .inf
not a number: !!float .nan

--------------------------------------------------------------------------------

(stream
  (document
    (block_node
      (block_mapping
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (integer_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (integer_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (float_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (float_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (tag)
            (plain_scalar
              (float_scalar))))))))

================================================================================
Example 10.8. JSON Tag Resolution
================================================================================
A null: null
Booleans: [ true, false ]
Integers: [ 0, -0, 3, -19 ]
Floats: [ 0., -0.0, 12e03, -2E+05 ]
Invalid: [ True, Null, 0o7, 0x3A, +12.3 ]

--------------------------------------------------------------------------------

(stream
  (document
    (block_node
      (block_mapping
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (plain_scalar
              (null_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (flow_sequence
              (flow_node
                (plain_scalar
                  (boolean_scalar)))
              (flow_node
                (plain_scalar
                  (boolean_scalar))))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (flow_sequence
              (flow_node
                (plain_scalar
                  (integer_scalar)))
              (flow_node
                (plain_scalar
                  (integer_scalar)))
              (flow_node
                (plain_scalar
                  (integer_scalar)))
              (flow_node
                (plain_scalar
                  (integer_scalar))))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (flow_sequence
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar))))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (flow_sequence
              (flow_node
                (plain_scalar
                  (boolean_scalar)))
              (flow_node
                (plain_scalar
                  (null_scalar)))
              (flow_node
                (plain_scalar
                  (integer_scalar)))
              (flow_node
                (plain_scalar
                  (integer_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar))))))))))

================================================================================
Example 10.9. Core Tag Resolution
================================================================================
A null: null
Also a null: # Empty
Not a null: ""
Booleans: [ true, True, false, FALSE ]
Integers: [ 0, 0o7, 0x3A, -19 ]
Floats: [ 0., -0.0, .5, +12e03, -2E+05 ]
Also floats: [ .inf, -.Inf, +.INF, .NAN ]

--------------------------------------------------------------------------------

(stream
  (document
    (block_node
      (block_mapping
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (plain_scalar
              (null_scalar))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar))))
        (comment)
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (double_quote_scalar)))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (flow_sequence
              (flow_node
                (plain_scalar
                  (boolean_scalar)))
              (flow_node
                (plain_scalar
                  (boolean_scalar)))
              (flow_node
                (plain_scalar
                  (boolean_scalar)))
              (flow_node
                (plain_scalar
                  (boolean_scalar))))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (flow_sequence
              (flow_node
                (plain_scalar
                  (integer_scalar)))
              (flow_node
                (plain_scalar
                  (integer_scalar)))
              (flow_node
                (plain_scalar
                  (integer_scalar)))
              (flow_node
                (plain_scalar
                  (integer_scalar))))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (flow_sequence
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar))))))
        (block_mapping_pair
          key: (flow_node
            (plain_scalar
              (string_scalar)))
          value: (flow_node
            (flow_sequence
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar)))
              (flow_node
                (plain_scalar
                  (float_scalar))))))))))