ACTION-88 optional comma and ambiguity in syntax.

Hi,
The following seems to capture what we (may) want:
In the grammar [1], replace:
<<
npttimedef    = [ deftimeformat ":"] [ clocktime ] "," [ clocktime ]
>>
by
<<
npttimedef    = [ deftimeformat ":"] ( ( clocktime [ "," [ clocktime ] ]
                                        / ( "," [ clocktime ] ) )
>>
So we are safe on this side.

[1] http://www.w3.org/2008/WebVideo/Fragments/wiki/Syntax

-- 
Baroula que barouleras, au tiéu toujou t'entourneras.

         ~~Yves