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RDF and URIs (was Re: Modularity, et al.)
- From: Wayne Steele <firstname.lastname@example.org>
- To: email@example.com
- Date: Sat, 07 Apr 2001 23:37:09 -0700
This all seems solvable except for the RDF part.
I could envision a way for a resource to specify (when retrieved) "This is
my Canonical URI" - then to test identity you can retrieve the resources and
see what they say.
Supplement this with some agreeable algorthims, for instance that
"http://example.org/doc#foo" is equivalent to
"http://example.org/doc#xpointer(foo)", and I think a pretty good 80/20
point for URI identity can be reached.
But RDF is the problem, because it has a "special" way of looking at URIs.
I've examined RDF, and have considered using it, but this flaw is always the
biggest stumbling block.
Is there any hope for resolving this RDF/URI infidelity?
From: John Cowan <firstname.lastname@example.org>
To: "Steven R. Newcomb" <email@example.com>
CC: firstname.lastname@example.org, email@example.com,
Subject: Re: Modularity (was: Linkbases, Topic Maps,and RDF Knowledge Bases
-- help me understand, please)
Date: Sun, 08 Apr 2001 01:20:18 -0400 (EDT)
Steven R. Newcomb scripsit:
>Actually, fetching the resources does not, in the general case, permit us
>to determine that the resources have the same identity.
Oh yes, I know. I hammered on that point over and over
on xml-uri among other places:
Octet identity of entity bodies is neither
necessary nor sufficient for identity of
The official line is that resources are identical
iff their URIs are identical, although I take a
more relaxed view: two URIs may refer to the same
resource if the owner says so. For example,
are according to me the same resource.
(Don't bother going there.)
But I was addressing a different point: namely, the undecidability
of whether two syntactically different XPointers point to the
same part of a given document without examining the document.
For XLink purposes, they are the same if they refer to the
same thing in document; for RDF purposes, they are the
John Cowan firstname.lastname@example.org
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