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RE: rdf:about=""?

From: DuCharme, Bob (LNG-CHO) <bob.ducharme@lexisnexis.com>
Date: Mon, 21 Jun 2004 14:43:50 -0400
Message-ID: <FEF4858E8AB32D4EAC2CF2A7D85386EBE539DB@lnxdayexch06b.lexis-nexis.com>
To: "'Benja Fallenstein'" <b.fallenstein@gmx.de>
Cc: "'www-rdf-interest@w3.org'" <www-rdf-interest@w3.org>

Thanks. I tried many google searches first, on things like "rdf:about 'empty
string'" without much luck.  

I see now from http://www.faqs.org/rfcs/rfc2396.html that "A URI reference
that does not contain a URI is a reference to the current document."


-----Original Message-----
From: www-rdf-interest-request@w3.org
[mailto:www-rdf-interest-request@w3.org] On Behalf Of Benja Fallenstein
Sent: Monday, June 21, 2004 2:22 PM
To: DuCharme, Bob (LNG-CHO)
Cc: 'www-rdf-interest@w3.org'
Subject: Re: rdf:about=""?

Hash: SHA1

The empty URI reference refers to the base URI. What the base URI is depends
on the document context (simplified algorithm: xml:base if available,
otherwise network location of the document containing the reference).

It's not in w3.org/tr, it's in the RFC that defines URIs, which I'm too lazy
to dig up, Google is your friend ;-)

- - Benja

DuCharme, Bob (LNG-CHO) wrote:
| Adobe's specification for XMP [1] tells us that the rdf:about
attribute may
| be "an empty string ... which means that the XMP is physically local 
| to the resource being described." I've seen other uses of rdf:about="" 
| being used to indicate that the metadata shown describes the resource 
| that contains it. I suppose it's the most abbreviated relative URI 
| possible. Is it kosher? With or without xml:base being declared? Is 
| this possibility described at any document in  <http://www.w3.org/tr> 
| www.w3.org/tr? I
| around and didn't see anything.
| (I am aware that XMP uses its own, uhhh, "profile" of RDF, so it may
be part
| of that.)
| thanks,
| Bob
| [1] http://partners.adobe.com/asn/tech/xmp/pdf/xmpspecification.pdf
| <http://partners.adobe.com/asn/tech/xmp/pdf/xmpspecification.pdf> ,
page 21

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Received on Monday, 21 June 2004 14:44:51 UTC

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