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Subject: Re: [xri] What is this XRD is for?


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I think of it as the Aliases are alternate names for the thing the XRD =
is about.

The Subject if present is the canonical name of the thing the XRD is =
about.

Thinking of them as names rather than web resources saves a lot of =
aggravation.

Some applications may use the name to resolve a representation of the =
named thing, but that is outside of the scope of XRD.

The retrieved representation of an alias is not guaranteed to be the =
same as the subject.   eg the alias may return a 303 to the Subject or =
something else entirely.  =20

The Subject need not have any information resource or retrievable =
representation associated with the named thing.
(Abstract identifier/non information resource)

John B.

On 2010-02-05, at 11:03 AM, Scott Cantor wrote:

> Eran Hammer-Lahav wrote on 2010-02-05:
>> Didn't say it is NOT, just that this is not a foregone conclusion. =
The XRD
>> might be about the Aliases too, but that is *application* specific =
(where
>> the rat hole of resource vs representation lives).
>=20
> Well, you did actually say "not", which is why I was confused, but =
I'll
> leave it alone. I'm not intending to debate URI theory, but if you =
make
> explicit statements in the spec about the relationship of the XRD =
content
> and the subject URI in terms of words like "resource", it's somewhat
> unavoidable.
>=20
> I think my concern is that you will find that nobody who isn't =
familiar with
> that rathole is going to end up treating the Alias in an
> application-specific manner. They'll do exactly what you'd expect and =
treat
> it as "the same thing" for application purposes, and if that's ok, =
we're
> fine.
>=20
> -- Scott
>=20
>=20
>=20
> ---------------------------------------------------------------------
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>=20


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