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Heads up: RFC2996bis, possible problem for RDF

From: Graham Klyne <gk@ninebynine.org>
Date: Tue, 17 Feb 2004 12:17:09 +0000
Message-Id: <5.1.0.14.2.20040217121140.00bad220@127.0.0.1>
To: rdf core <w3c-rdfcore-wg@w3.org>

I've just reviewed:

    http://gbiv.com/protocols/uri/rev-2002/rfc2396bis.html
Modified: 16 February 2004 11:36:15
Size: 167.42 KB (171437 bytes)

Which has recently been "last called" in the IETF URI informal group in 
preparation for an IESG last-call request, per:
   http://lists.w3.org/Archives/Public/uri/2004Feb/0082.html

I am concerned that the empty component normalization rules may be 
troublesome for RDF.  My review comments are at:
   http://lists.w3.org/Archives/Public/uri/2004Feb/0094.html

The specific example raised is:

[[[[
Section 6.2.2.3:
I'm concerned about empty component normalization:
In RDF usage, the URIs:
     http://example.org/
and
     http://example.org#
would result in quite distinct resource identifiers, e.g. in:

[[
Triples of the Data Model in N-Triples Format (Sub, Pred, Obj)

<http://www.w3.org/RDF/Validator/run/foo> <http://example.org/prop> "value" .

The original RDF/XML document

1: <?xml version="1.0"?>
2: <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
3:   xmlns="http://example.org/">
4:   <rdf:Description rdf:about="foo">
5:     <prop>value</prop>
6:   </rdf:Description>
7: </rdf:RDF>
]]

and

[[
Triples of the Data Model in N-Triples Format (Sub, Pred, Obj)

<http://www.w3.org/RDF/Validator/run/foo> <http://example.org#prop> "value" .

The original RDF/XML document

1: <?xml version="1.0"?>
2: <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
3:   xmlns="http://example.org#">
4:   <rdf:Description rdf:about="foo">
5:     <prop>value</prop>
6:   </rdf:Description>
7: </rdf:RDF>
]]

(RDF triples generated by http://www.w3.org/RDF/Validator/)

Are distinct RDF graphs, even though the URIs are equivalent under the
normalization rules given.
]]]]

#g


------------
Graham Klyne
For email:
http://www.ninebynine.org/#Contact
Received on Tuesday, 17 February 2004 07:17:39 EST

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