<tfoot> headers & Accessibility?

Dear All

I apologize if this is an inappropriate place to email this question.  I
wasn't able to find an answer to my question in the mailing lists.

I'm having trouble understanding how to use <thead>, <tfoot> and <tbody>
and id and header attributes.  Using the example on this page is this
correct?

http://www.w3.org/TR/WCAG10-HTML-TECHS/#data-tables

<table border="1" 
 summary="This table charts the number of
          cups of coffee consumed by each senator,  
          the type of coffee (decaf or regular),
          and whether taken with sugar.">
  <caption>Cups of coffee consumed by each senator</caption>
  <thead>
    <tr>   
      <th id="header1">Name</th>
      <th id="header2">Cups</th>     
      <th id="header3" abbr="Type">Type of  Coffee</th>   
      <th id="header4">Sugar?</th>
    </tr>
  </thead>
  <tfoot>
    <tr>   
      <td>Name</td>
      <td>Cups</td>     
      <td>Type of  Coffee</td>   
      <td>Sugar?</td>
    </tr>
  </tfoot>
  <tbody>
    <tr>  
      <td headers="header1">T. Sexton</td>  
      <td headers="header2">10</td>
      <td headers="header3">Espresso</td>
      <td headers="header4">No</td>
    </tr>
    <tr>  
      <td headers="header1">J. Dinnen</td> 
      <td headers="header2">5</td>
      <td headers="header3">Decaf</td>
      <td headers="header4">Yes</td>
    </tr>
  </tbody>
</table>

Any help would be deeply appreciated.

Kind regards,
Scott Rippon.