xml.rss("version" => "2.0", "xmlns:dc" => "http://purl.org/dc/elements/1.1/") do
  xml.channel do
    @rss_options.each {|key, value| instance_eval("xml.#{key}(value)") }

    for item in @rss_items
      xml.item do
        [:title, :description, :pubDate, :guid, :link].each do |meth|
          value, full_meth = nil, "#{meth}_for_rss"
          if item.respond_to? full_meth
            value = item.method(full_meth).arity == 1 ? item.send(full_meth, controller) : item.send(full_meth)
          end
          instance_eval("xml.#{meth}(value)") if value
        end
      end
    end
  end
end