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This class represents a YAML Mapping.
A Psych::Nodes::Mapping node may have 0 or more children, but must have an even number of children.  Here are the valid children a Psych::Nodes::Mapping node may have:
Create a new Psych::Nodes::Mapping object.
anchor is the anchor associated with the map or nil. tag is the tag associated with the map or nil. implicit is a boolean indicating whether or not the map was implicitly started. style is an integer indicating the mapping style.
See also Psych::Handler#start_mapping
 
               # File psych/lib/psych/nodes/mapping.rb, line 48
def initialize anchor = nil, tag = nil, implicit = true, style = BLOCK
  super()
  @anchor   = anchor
  @tag      = tag
  @implicit = implicit
  @style    = style
end