xml << %(<?xml version="1.0" encoding="ISO-8859-1"?>\n)
xml.rss("version" => "2.0", "xmlns:dc" => "http://purl.org/dc/elements/1.1/") do
  xml.channel do
    xml.title("ROOL Documents: #{@book.name}")
    xml.link(home_url)
    xml.description "ROOL I2 Wiki: Tracking all versions for #{@book.name}"
    xml.language "en-us"
    xml.ttl "40"

    @book.versions.find(:all, :limit => 25, :include => :page).each do |version|
      xml.item do
        xml.title("ROOL Documents: #{version.page.title}")
        xml.description("New version: #{version.number}")
        xml.pubDate(version.created_at.rfc822)
        xml.guid(version_url(:page_title => version.page, :version_number => version.number))
        xml.link(version_url(:page_title => version.page, :version_number => version.number))
      end
    end
  end
end