# File lib/action_view/helpers/asset_tag_helper.rb, line 21
      def auto_discovery_link_tag(type = :rss, options = {}, tag_options = {})
        tag(
          "link", 
          "rel" => tag_options[:rel] || "alternate",
          "type" => tag_options[:type] || "application/#{type}+xml",
          "title" => tag_options[:title] || type.to_s.upcase,
          "href" => url_for(options.merge(:only_path => false))
        )
      end