variable numbers of columns in PDF-tables

Hello www-xsl-fo,

I recently met a problem which I would like to present to you hoping you
could give some assistance or answers.
My problem concerns variable numbers of columns in PDF-tables.

An example - table in XML:
<TABLE>
<TGROUP COLS="3">
<COLSPEC COLNUM="1" COLNAME="col1" COLWIDTH="*">
<COLSPEC COLNUM="2" COLNAME="col2" COLWIDTH="*">
<COLSPEC COLNUM="3" COLNAME="col3" COLWIDTH="*">
<TBODY>
<ROW>
<ENTRY COLNAME="col1">11</ENTRY>
<ENTRY COLNAME="col2">22</ENTRY>
<ENTRY COLNAME="col3">33</ENTRY>
</ROW>
<ROW>
<ENTRY COLNAME="col1">44</ENTRY>
<ENTRY COLNAME="col2">55</ENTRY>
<ENTRY COLNAME="col3">66</ENTRY>
</ROW>
</TBODY>
</TGROUP>
<CAPTION>tabelle 1</CAPTION>
</TABLE>

The number of columns for the XML-table varies; the column-width is 15 cm.
For the PDF output the tgroup-attribute cols shall by divided by the
table-width.
The result shall be written in <fo:table-column> to the attribute
column-width.
How can this be achieved by means of an XSL-File?

Thank you very much in advance!
Dirk Heckler