Re: NIR SIDETRACK Re: Change Proposal for HttpRange-14

On Sat, Mar 31, 2012 at 8:45 PM, Michael Brunnbauer <brunni@netestate.de> wrote:
>
> Hello Jonathan,
>
> On Sat, Mar 31, 2012 at 10:54:09AM -0400, Jonathan A Rees wrote:
>> > I have a question: Can two different entities have the same representation ?
>> I've never heard anything say anything that would rule this out.
>
> Hmm... so from a 200 statuscode and HR14, I can conclude that I have
> a representation of it, that is is an IR and therefor has a representation
> that conveys the essential characteristics of it (definition of IR at
> http://www.w3.org/2001/tag/doc/uddp-20120229/), but not that the
> representation I got actually is a representation that conveys the essential
> characteristics of it ?

Well not necessarily. The problem is that 'representation' has at
least three different meanings in these discussions. There's (1) the
REST / AWWW glossary / HTTPbis definition, the record of the state of
something, which I take to mean that descriptions, as well as
depictions, content, etc. are representations. There's (2) the usage
where it means expression or encoding of information, similar to what
I call "instance" or TimBL calls "content", which would be a special
case of (1). (2) shows up in RFC 2616 and in parts of AWWW. Then
there's 'representation' as (3) whatever you get in a 200 response,
what I call "nominal representation". (1)=(3) if the manner of
'representing' can be idiosyncratic to each resource. So you have to
be careful which sense you mean. Most of the specs are pretty murky on
this, and that's part, maybe most, of the reason why the conversation
is so incredibly painful.

Jonathan

> Regards,
>
> Michael Brunnbauer
>
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Received on Sunday, 1 April 2012 15:05:39 UTC