to_xml

# File lib/rss/rss.rb, line 982
    def to_xml(version=nil, &block)
      if version.nil? or version == @rss_version
        to_s
      else
        RSS::Maker.make(version) do |maker|
          setup_maker(maker)
          block.call(maker) if block
        end.to_s
      end
    end