odf 1.1 para 4.1.1

Header numbering can be changed by additional attributes, similar to
those on list items (see section 4.3.2, below). The numbering of
headers can be restarted by setting the text:restart-numbering
attribute to true.

'Can' statement? How does that stand in the 'shall should may' list?

If the attribute is set to true, at what level/value should numbering
be restarted?
If used on a heading level 6, are level 6 headings only affected?
Is this implementation dependent hence an interoperability issue?

regards

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