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 'rexml/encoding'
require 'rexml/source'

module REXML
	# NEEDS DOCUMENTATION
	class XMLDecl < Child
		include Encoding

		DEFAULT_VERSION = "1.0";
		DEFAULT_ENCODING = "UTF-8";
		DEFAULT_STANDALONE = "no";
		START = '<\?xml';
		STOP = '\?>';

		attr_accessor :version, :standalone
    attr_reader :writeencoding, :writethis

		def initialize(version=DEFAULT_VERSION, encoding=nil, standalone=nil)
      @writethis = true
      @writeencoding = !encoding.nil?
			if version.kind_of? XMLDecl
				super()
				@version = version.version
				self.encoding = version.encoding
        @writeencoding = version.writeencoding
				@standalone = version.standalone
			else
				super()
				@version = version
				self.encoding = encoding
				@standalone = standalone
			end
			@version = DEFAULT_VERSION if @version.nil?
		end

		def clone
			XMLDecl.new(self)
		end

    # indent::
    #   Ignored.  There must be no whitespace before an XML declaration
    # transitive::
    #   Ignored
    # ie_hack::
    #   Ignored
		def write(writer, indent=-1, transitive=false, ie_hack=false)
      return nil unless @writethis or writer.kind_of? Output
			writer << START.sub(/\\/u, '')
      if writer.kind_of? Output
        writer << " #{content writer.encoding}"
      else
        writer << " #{content encoding}"
      end
			writer << STOP.sub(/\\/u, '')
		end

		def ==( other )
		  other.kind_of?(XMLDecl) and
		  other.version == @version and
		  other.encoding == self.encoding and
		  other.standalone == @standalone
		end

		def xmldecl version, encoding, standalone
			@version = version
			self.encoding = encoding
			@standalone = standalone
		end

		def node_type
			:xmldecl
		end

		alias :stand_alone? :standalone
    alias :old_enc= :encoding=

    def encoding=( enc )
      if enc.nil?
        self.old_enc = "UTF-8"
        @writeencoding = false
      else
        self.old_enc = enc
        @writeencoding = true
      end
      self.dowrite
    end

    # Only use this if you do not want the XML declaration to be written;
    # this object is ignored by the XML writer.  Otherwise, instantiate your
    # own XMLDecl and add it to the document.
    #
    # Note that XML 1.1 documents *must* include an XML declaration
    def XMLDecl.default
      rv = XMLDecl.new( "1.0" )
      rv.nowrite
      rv
    end

    def nowrite
      @writethis = false
    end

    def dowrite
      @writethis = true
    end

    def inspect
      START.sub(/\\/u, '') + " ... " + STOP.sub(/\\/u, '')
    end

		private
		def content(enc)
			rv = "version='#@version'"
			rv << " encoding='#{enc}'" if @writeencoding || enc !~ /utf-8/i
			rv << " standalone='#@standalone'" if @standalone
			rv
		end
	end
end