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Re: User Agent Media Fragment Resolution and Processing

From: RaphaŽl Troncy <Raphael.Troncy@cwi.nl>
Date: Wed, 29 Apr 2009 12:21:52 +0200
Message-ID: <49F82A40.70806@cwi.nl>
To: Michael Hausenblas <michael.hausenblas@deri.org>
CC: Media Fragment <public-media-fragment@w3.org>

> As of my ACTION-64 [1] regarding the 'User Agent Media Fragment Resolution
> and Processing' I have started to describe the necessary steps on the Wiki
> [2]. Comments (best inline in the Wiki) are very welcome!

Nice work! Btw, I appreciate graffle diagrams, can you also output svg? 
I think you can also export visio diagrams :-) I wish to have 
OmniGraffle on Windows, but it is unlikely to come according to the omni 

Regarding the content, your step 2 reads:
"IFF the T.fragment is VALID, the processing continues, ELSE essentially 
three alternative behaviors are possible: (i) fallback to default 
behavior, (ii) notify user and then fall back, or (iii) notify user and 
await instructions. One SHOULD take the Common User Agent Problems into 

with the note: "we have to decide what we do here."
I think we have not much to decide ... if there is a fragment which is 
invalid according to the MF grammar, then it might be a very well valid 
html or xml fragment for example. So the answer should be: "(i) fallback 
to default behavior". What is the use case for which you would like to 
notify the user?


RaphaŽl Troncy
CWI (Centre for Mathematics and Computer Science),
Science Park 123, 1098 XG Amsterdam, The Netherlands
e-mail: raphael.troncy@cwi.nl & raphael.troncy@gmail.com
Tel: +31 (0)20 - 592 4093
Fax: +31 (0)20 - 592 4312
Web: http://www.cwi.nl/~troncy/
Received on Wednesday, 29 April 2009 10:26:51 UTC

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