cals tables: competing colwidths

I had question that didn't seem answered in the CALS table
spec.  I'm
wondering what is supposed to happen if a tgroup, thead, and
tbody all
have colspec children with different colwidth attributes in
them,
especially if they are supposed to be in the same column. 
Does the level
with the widest colwidth value "win"?

In case an example helps:

<table>
  <tgroup cols="2">
    <colspec colwidth="4*" />
    <colspec />
    <thead>
      <colspec colwidth="2*" />
      <colspec />
      <row>
        <entry>2*?</entry>
        <entry>.</entry>
      </row>
    </thead>
    <tfoot>
      <colspec colwidth="3*" />
      <colspec />
      <row>
        <entry>3*?</entry>
        <entry>.</entry>
      </row>
    </tfoot>
    <tbody>
      <row>
        <entry>4*?</entry>
        <entry>.</entry>
      </row>
    </tbody>
  </tgroup>
</table>

I don't know whether the table should look something like
this ...
 _____________________
| 2*?             | . |
|_________________|___|
| 4*?             | . |
|_________________|___|
| 3*?             | . |
|_________________|___|

... or, heaven forbid, this ...
 _____________
| 2*?     | . |
|_________|___|_______
| 4*?             | . |
|_________________|___|
| 3*?         | . |
|_____________|___|

... or something else completely?

Thanks,

Max Starkenburg
http://cnx.org

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