Which is definitive odf?

Looking at 1.1 on the Oasis site,
http://www.oasis-open.org/specs/index.php#opendocumentv1.1
a number of different formats are offered.

Which is the definitive standard definition please?
Anyone know?
3 versions are offered.

TIA

-- 
Dave Pawson
XSLT XSL-FO FAQ.
http://www.dpawson.co.uk