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Re: reference needed

From: Steven Gollery <sgollery@cadrc.calpoly.edu>
Date: Tue, 03 Jun 2003 09:29:19 -0700
Message-ID: <3EDCCCDF.10003@cadrc.calpoly.edu>
To: www-rdf-logic <www-rdf-logic@w3.org>

Sandro,

Thank you for the pointers to further information.

It looks like I'm going to have to do a certain amount of background 
reading before I can have a real understanding of all the issues here, 
but looking at http://esw.w3.org/topic/SlashURI, I have a question. It 
looks like this discussion is 'browser-centric," but what if we're using 
an inferencing engine to reason about RDF statements? Would the engine 
treat all occurrences of SlashURIs as referring to the thing itself, or 
would it have to try to access each SlashURI and check what comes back, 
perhaps performing different kinds of inferencing depending on whether 
the response is a "302 found" redirect or not?

Steve



Sandro Hawke wrote:

>Bernard Vatant writes:
>
>>Hello Steven
>>
>>Your question is exactly what Topic Maps Published Subjects address.
>>See http://www.mondeca.com/pubsubj/
>>
>>And singularly the document at:
>>http://www.ontopia.net/tmp/pubsubj-gentle-intro.htm
>>
>
>But I don't see that that address the issue in RDF.
>
>Steven Gollery writes:
>
>>>I've been trying to find a reference to an issue that I read about a few
>>>weeks ago and now can't remember where I saw it. The situation goes like
>>>this:
>>>
>>>Suppose we want to represent a real world object with a URL. We put a
>>>web page at that URL describing the object. Now, when we make statements
>>>in RDF (or DAML, or OWL) with that URL as the subject or object, there
>>>is a potential confustion about whether the statement is about the web
>>>page or about the object that the web page describes. For instance: if a
>>>web page describes a particular copy of "War and Peace" and we have an
>>>RDF statement that the author of
>>>"http://www.mybook.net/WarAndPeace.html" is "Leo Tolstoy", does that
>>>mean that he wrote the book, or the web page?
>>>
>
>An excellent summary of the issue.
>
>>>This is apparently a topic that has received thorough discussion, and
>>>even has a name, so I don't want to talk about it here. I'm just hoping
>>>someone can point me to a paper or something that covers this topic.Or
>>>just the name of the topic would be enough to start with.
>>>
>
>I'm not so sure it has a good name.  It's related to httpRange-14 [1],
>but I don't think it's quite the same thing.  In my most recent
>attempt to name it, I called it "When Browsable and Unambiguous
>Collide" [2], although I don't love that name either.  
>
>For RDF (where the syntax offers no support of distinguishing subject
>indicators), I recommend using either a HashURI [3] or a 303-redirect
>SlashURI [4].
>
>   -- sandro
>
>[1] http://www.w3.org/2001/tag/ilist#httpRange-14
>[2] http://esw.w3.org/topic/WhenBrowsableAndUnambiguousCollide
>[3] http://esw.w3.org/topic/HashURI
>[4] http://esw.w3.org/topic/SlashURI
>
>
Received on Tuesday, 3 June 2003 12:31:16 GMT

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