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ISSUE-3: Does our MF URI syntax imply that we need to update MIME Type registrations?

From: RaphaŽl Troncy <Raphael.Troncy@cwi.nl>
Date: Wed, 28 Jan 2009 14:47:57 +0100
Message-ID: <4980620D.8050206@cwi.nl>
To: Media Fragment <public-media-fragment@w3.org>

ISSUE-3: Does our MF URI syntax imply that we need to update MIME Type 
registrations?

http://www.w3.org/2008/WebVideo/Fragments/tracker/issues/3
Raised by: Michael Hausenblas

In [1] Michael argued that whenever we talk about URI semantics, we need 
to start with RFC3986 section 3.5:

'The semantics of a fragment identifier are defined by the set of
representations that might result from a retrieval action on the primary
resource. The fragment's format and resolution is therefore dependent on the
media type [RFC2046] of a potentially retrieved representation, even
though such a retrieval is only performed if the URI is dereferenced. If
no such representation exists, then the semantics of the fragment are
considered unknown and are effectively unconstrained. Fragment identifier
semantics are independent of the URI scheme and thus cannot be
redefined by scheme specifications.'

Further, from RFC2046 we learn that the MIME Type Registrations (taking 
a JPG still image as an example) for JPEG 2000 (ISO/IEC15444) is 
specified in RFC3745 where no fragments are defined, hence the general 
rules from RFC3986 apply.

Do we need to update all registries of targeted media types or are we 
fine with sticking to the fallback rule from RFC3986 ('If no such 
representation exists, then the semantics of the fragment are considered 
unknown and are effectively unconstrained.')?

[1] 
http://lists.w3.org/Archives/Public/public-media-fragment/2009Jan/0043.html

-- 
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, 28 January 2009 13:48:39 GMT

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