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diff --git a/ruby_1_9_3/ext/psych/lib/psych/nodes/document.rb b/ruby_1_9_3/ext/psych/lib/psych/nodes/document.rb
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+++ b/ruby_1_9_3/ext/psych/lib/psych/nodes/document.rb
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+module Psych
+  module Nodes
+    ###
+    # This represents a YAML Document.  This node must be a child of
+    # Psych::Nodes::Stream.  A Psych::Nodes::Document must have one child,
+    # and that child may be one of the following:
+    #
+    # * Psych::Nodes::Sequence
+    # * Psych::Nodes::Mapping
+    # * Psych::Nodes::Scalar
+    class Document < Psych::Nodes::Node
+      # The version of the YAML document
+      attr_accessor :version
+
+      # A list of tag directives for this document
+      attr_accessor :tag_directives
+
+      # Was this document implicitly created?
+      attr_accessor :implicit
+
+      # Is the end of the document implicit?
+      attr_accessor :implicit_end
+
+      ###
+      # Create a new Psych::Nodes::Document object.
+      #
+      # +version+ is a list indicating the YAML version.
+      # +tags_directives+ is a list of tag directive declarations
+      # +implicit+ is a flag indicating whether the document will be implicitly
+      # started.
+      #
+      # == Example:
+      # This creates a YAML document object that represents a YAML 1.1 document
+      # with one tag directive, and has an implicit start:
+      #
+      #   Psych::Nodes::Document.new(
+      #     [1,1],
+      #     [["!", "tag:tenderlovemaking.com,2009:"]],
+      #     true
+      #   )
+      #
+      # == See Also
+      # See also Psych::Handler#start_document
+      def initialize version = [], tag_directives = [], implicit = false
+        super()
+        @version        = version
+        @tag_directives = tag_directives
+        @implicit       = implicit
+        @implicit_end   = true
+      end
+
+      ###
+      # Returns the root node.  A Document may only have one root node:
+      # http://yaml.org/spec/1.1/#id898031
+      def root
+        children.first
+      end
+    end
+  end
+end