<sales>
   <product>Windows 98
      <period name="Q1">82</period>
      <period name="Q2">64</period>
      <period name="Q3">58</period>
   </product>
   <product>Windows NT
      <period name="Q1">17</period>
      <period name="Q2">44</period>
      <period name="Q3">82</period>
   </product>
</sales>