まんま >> require "hpricot" => true >> doc = Hpricot('<image height="300">x</image><image hieght="200">y</image>') => #<Hpricot::Doc {elem <image height="300"> "x" </image>} {elem <image hieght="200"> "y" </image>}> >> (doc / 'image').sort_by {|img| img['height'].to_i}[-1] => {elem <image height="300">…</image>