nokotest.rb

require 'rubygems'
require 'nokogiri'

doc = Nokogiri::HTML.parse(<<-eohtml)
    <table>
      <tr><td>9</td><td>MRobinson</td></tr>
      <tr><td>10</td><td>RGoldblatt</td></tr>
      <tr><td>11</td><td>JBrancato</td></tr>
      <tr><td>XX</td><td><table><tr><td>Poo</td></tr></table></td></tr>
    </table>
  </body>
</html>
eohtml

puts doc.css('table > tr').size