tables module, use of th colspan instead of caption

In the third example of:
http://www.w3.org/TR/xhtml2/mod-tables.html#header-data

I see the following piece of code:
<thead>
   <tr>
     <th colspan="5" scope="colgroup">Community Courses -- Bath Autumn 
1997</th>
   </tr>
</thead>

Isn’t this a typical text for <caption>, where using a <th> with colspan 
attribute is inappropriate?


~Grauw

-- 
Ushiko-san! Kimi wa doushite, Ushiko-san!!