The new ODS (Open Document Spreadsheet) is more powerful than the CSV one, 
because each table has its own sheet.

My implementation choice was to use a simple flat XML file and not a zipped 
directory of different content/style/metadata files.

I only test the sample.ods file against OpenOffice.org 2.4 on GNU/Linux. 
Feedbacks from other platforms are welcome.

Actually, this target fail to do a readable table.ods file from 
test/target/table.t2t because of the use of "<" and ">" chars that should be 
escaped and remplaced by &lt; and &gt;