晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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require "rss/rss"

module RSS
  ##
  #
  # Provides a set of builders for various RSS objects
  #
  # * Feeds
  #   * RSS 0.91
  #   * RSS 1.0
  #   * RSS 2.0
  #   * Atom 1.0
  #
  # * Elements
  #   * Atom::Entry

  module Maker

    # Collection of supported makers
    MAKERS = {}

    class << self
      # Builder for an RSS object
      # Creates an object of the type passed in +args+
      #
      # Executes the +block+ to populate elements of the created RSS object
      def make(version, &block)
        self[version].make(&block)
      end

      # Returns the maker for the +version+
      def [](version)
        maker_info = maker(version)
        raise UnsupportedMakerVersionError.new(version) if maker_info.nil?
        maker_info[:maker]
      end

      # Adds a maker to the set of supported makers
      def add_maker(version, normalized_version, maker)
        MAKERS[version] = {:maker => maker, :version => normalized_version}
      end

      # Returns collection of supported maker versions
      def versions
        MAKERS.keys.uniq.sort
      end

      # Returns collection of supported makers
      def makers
        MAKERS.values.collect { |info| info[:maker] }.uniq
      end

      # Returns true if the version is supported
      def supported?(version)
        versions.include?(version)
      end

      private
      # Can I remove this method?
      def maker(version)
        MAKERS[version]
      end
    end
  end
end

require "rss/maker/1.0"
require "rss/maker/2.0"
require "rss/maker/feed"
require "rss/maker/entry"
require "rss/maker/content"
require "rss/maker/dublincore"
require "rss/maker/slash"
require "rss/maker/syndication"
require "rss/maker/taxonomy"
require "rss/maker/trackback"
require "rss/maker/image"
require "rss/maker/itunes"