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How to zip an XML file?
def write_data(data)
  File.open(@filepath,"w") do |f|
    f.write(%[<?xml version="1.0" encoding="UTF-8"?>n])
    f.write(%[<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">n])
    f.write(data)
    f.write(%[</urlset>])
    f.close
  end
end

File.open(@filepath, 'w') do |f|
  gz = Zlib::GzipWriter.new(f)
  gz.write(%[<?xml version="1.0" encoding="UTF-8"?>n])
  gz.write(%[<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">n])
  gz.write(data)
  gz.write(%[</urlset>])
  gz.close
end