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class Hash
  def to_yaml( opts = {} )
    YAML::quick_emit( self, opts ) do |out|
      out.map( taguri, to_yaml_style ) do |map| 
        keys = self.keys.sort_by {|a| a.to_s }
        keys.each do |k|
          map.add( k, self[k] )
        end     
      end   
    end 
  end   
end