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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# XSD4R - XML Instance parser library.
# Copyright (C) 2002, 2003  NAKAMURA, Hiroshi <nahi@ruby-lang.org>.

# This program is copyrighted free software by NAKAMURA, Hiroshi.  You can
# redistribute it and/or modify it under the same terms of Ruby's license;
# either the dual license version in 2003, or any later version.


require 'xsd/qname'
require 'xsd/ns'
require 'xsd/charset'


module XSD
module XMLParser


class Parser
  class ParseError < Error; end
  class FormatDecodeError < ParseError; end
  class UnknownElementError < FormatDecodeError; end
  class UnknownAttributeError < FormatDecodeError; end
  class UnexpectedElementError < FormatDecodeError; end
  class ElementConstraintError < FormatDecodeError; end

  @@parser_factory = nil

  def self.factory
    @@parser_factory
  end

  def self.create_parser(host, opt = {})
    @@parser_factory.new(host, opt)
  end

  def self.add_factory(factory)
    if $DEBUG
      puts "Set #{ factory } as XML processor."
    end
    @@parser_factory = factory
  end

public

  attr_accessor :charset

  def initialize(host, opt = {})
    @host = host
    @charset = opt[:charset] || nil
  end

  def parse(string_or_readable)
    @textbuf = ''
    prologue
    do_parse(string_or_readable)
    epilogue
  end

private

  def do_parse(string_or_readable)
    raise NotImplementError.new(
      'Method do_parse must be defined in derived class.')
  end

  def start_element(name, attrs)
    @host.start_element(name, attrs)
  end

  def characters(text)
    @host.characters(text)
  end

  def end_element(name)
    @host.end_element(name)
  end

  def prologue
  end

  def epilogue
  end

  def xmldecl_encoding=(charset)
    if @charset.nil?
      @charset = charset
    else
      # Definition in a stream (like HTTP) has a priority.
      p "encoding definition: #{ charset } is ignored." if $DEBUG
    end
  end
end


end
end