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Re: Named Graphs and Content Negotiation

From: Robert Sanderson <azaroth42@gmail.com>
Date: Thu, 31 May 2012 15:54:20 -0600
Message-ID: <CABevsUGs1uCmtB9-e3dJMoCEWoPRrPMAVK_S2YTkyuEDhZci6Q@mail.gmail.com>
To: Bob Morris <morris.bob@gmail.com>
Cc: public-openannotation@w3.org
Good catch.

I propose the following amendment:

This form MUST ONLY be returned when retrieving an Annotation if the
client explicitly requests a Named Graph serialization, for example
through the use of HTTP Content Negotiation.  This restriction ...

Does that remove the HTTP protocol restriction sufficiently?


On Thu, May 31, 2012 at 3:49 PM, Bob Morris <morris.bob@gmail.com> wrote:
> OK, I concede that  [1] seems to slightly discourage the use of Named
> Graphs, though conceding their utility. Hence, my concern may not be
> of great impact.  But I am slightly concerned by the tex in the OAX
> spect:
> "This form MUST ONLY be returned when dereferencing an Annotation's
> URI if the client explicitly requests a Named Graph serialization via
> Content Negotiation. This restriction is to ensure interoperability
> with clients that can not parse the Named Graph serialization, and
> hence would be unable to parse the Annotation graph at all."
> Content Negotiation is defined by the http protocol, and the first
> sentence seems to assume that Named Graphs must have http URIs. (Maybe
> I'm wrong.  Maybe other dereferencable URI schemes can support http
> Content Negotiation???).   OA has plenty of advice or requirements
> about resources with http URIs, but this seems to be the only facility
> in OA that can't be used except with http URIs.
> Bob
> [1] http://www.openannotation.org/spec/extension/#NamedGraph
> --
> Robert A. Morris
> Emeritus Professor  of Computer Science
> UMASS-Boston
> 100 Morrissey Blvd
> Boston, MA 02125-3390
> IT Staff
> Filtered Push Project
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> Harvard University
> email: morris.bob@gmail.com
> web: http://efg.cs.umb.edu/
> web: http://etaxonomy.org/mw/FilteredPush
> http://www.cs.umb.edu/~ram
> ===
> The content of this communication is made entirely on my
> own behalf and in no way should be deemed to express
> official positions of The University of Massachusetts at Boston or
> Harvard University.
Received on Thursday, 31 May 2012 21:54:50 UTC

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