The 
                  tr element represents a single 
                  
                     table
                      row of data.
                  
               
The 
                  tr element represents a single 
                  
                     table
                      row of data.
                  
               
<table>
    <tr>
        <th colspan="2">Inches</th>
        <th>Lines</th>
    </tr>
    <tr>
        <th>Length (as far as complete)</th>
        <td>17</td>
        <td>6</td>
    </tr>
    <tr>
        <th>Depth of each ramus</th>
        <td>4</td>
        <td>9</td>
    </tr>
</table>
    This element must not contain text.
This element may contain the following children: pagebreak, td and th
http://www.daisy.org/ns/z3998/authoring/