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Re: Description of the 2-ways and the 4-ways handshake

From: David Singer <singer@apple.com>
Date: Wed, 6 May 2009 12:11:45 -0700
Message-Id: <p062408d9c62790929289@[17.202.35.52]>
To: Yves Lafon <ylafon@w3.org>
Cc: RaphaŽl Troncy <Raphael.Troncy@cwi.nl>, Silvia Pfeiffer <silviapfeiffer1@gmail.com>, Davy Van Deursen <davy.vandeursen@ugent.be>, Media Fragment <public-media-fragment@w3.org>, Michael Hausenblas <michael.hausenblas@deri.org>
At 3:55  -0400 6/05/09, Yves Lafon wrote:
>>I think, rather
>>? -- it is the server's syntax and task to do the selection
>
>In fact if "?" is needed, our fragment syntax is 
>just a hint, people owning their URIs can define 
>whatever naming scheme they want, the main issue 
>is finding the association between 
>identification of useful ranges someone awnts to 
>retrieve and URIs

There is a very big difference between ? and #. 
"?" is an instruction to the server;  a database 
query, for example.  It is part of the definition 
of the resource.  # is an instruction to the 
user-agent, a focusing instruction.

>
>># -- it is the MIME type's syntax and UA's task 
>>to do the selection, possibly assisted by an 
>>enhanced protocol with the server
>>
>>That is, if the UA is asked to focus the user's 
>>attention on a certain portion of the resource, 
>>it should do the best it can
>>a) to do said focusing
>>b) to use the network and server wisely
>>
>>If the protocol is HTTP-1.1-enhanced, then 
>>there may be new commands or headers it can 
>>use.  In the lack of that (e.g. HTTP 1.1 or 
>>even 1.0) it does the best it can.
>
>HTTP-1.1-enhanced ?
>Adding a range unit is in the same class of 
>adding a new content-type, that doesn't really 
>qualify as "enhancing" HTTP :)

Sorry, I just used the name as a short-hand. 
However, I think that a server that can 
co-operate with a UA over selecting time or or 
sub-parts of a temporal resource, is enhanced. 
And you need to know if the server you're talking 
to is enhanced in this way, as well.

>
>>
>>>   - In the case of the '?': the normal 
>>>behavior, it is a new resource that will be 
>>>completely served with a 200 OK response code. 
>>>The only extra specification we may add is a 
>>>link header to point towards the original 
>>>resource the segment comes from ...

if it even exists.  Don't forget, the ? may be 
processing instructions:  "make me a synthetic 
background 20 seconds long that looks vaguely 
like swirling water".

>>>
>>>I suggest to write that down in the next iteration of the WD :-)
>>>
>>>   RaphaŽl
>>>
>>>--
>>>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/
>>
>>
>>--
>>David Singer
>>Multimedia Standards, Apple Inc.
>>
>
>--
>Baroula que barouleras, au tiťu toujou t'entourneras.
>
>         ~~Yves


-- 
David Singer
Multimedia Standards, Apple Inc.
Received on Wednesday, 6 May 2009 19:13:34 GMT

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