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Re: ACTION-187: extensibility and parsing

From: Yves Lafon <ylafon@w3.org>
Date: Mon, 4 Oct 2010 08:08:21 -0400 (EDT)
To: Philip Jägenstedt <philipj@opera.com>
cc: Media Fragment <public-media-fragment@w3.org>
Message-ID: <alpine.DEB.1.10.1010040804370.4599@wnl.j3.bet>
On Wed, 22 Sep 2010, Philip Jägenstedt wrote:

> By extensibility I am not primarily talking about 3rd parties extending MF, 
> but about our own possibilities of updating the spec after MF 1.0. For the 
> purpose of discussion, assume that we want to add a dimension for filtering 
> the audio, e.g., freq=300,3000 to keep only the part of the audio that 
> corresponds (approximately) to human voice (300Hz-3000Hz).

Well, even in our case we have to be very careful in the way we do 
extensions, take for example the 'ref' proposal that was sent to the list 
to define a region (using a polygon), it is in the spatial dimension so in 
conflict with xywh. What does 
http://www.example.com/foo#xywh=10,20,34,40&ref=http://example.com/shape 
mean? Union? Intersection? fallback to xwyh if ref can't be processed?

So just stating that we can allow every possible extension in the grammar 
or in the parsing rules is far from being enough, we need to have a high 
bar to avoid such conflicts.

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

         ~~Yves
Received on Monday, 4 October 2010 12:08:23 GMT

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