W3C home > Mailing lists > Public > public-rdf-in-xhtml-tf@w3.org > November 2005

Re: CURIEs vs. QNames

From: Norman Walsh <Norman.Walsh@Sun.COM>
Date: Fri, 04 Nov 2005 14:53:33 -0500
To: "Mark Birbeck" <mark.birbeck@x-port.net>
Cc: "'Henry S. Thompson'" <ht@inf.ed.ac.uk>, <public-rdf-in-xhtml-tf@w3.org>
Message-ID: <87mzkkrxz6.fsf@nwalsh.com>
/ "Mark Birbeck" <mark.birbeck@x-port.net> was heard to say:
| Hi Henry,
|> if someAttribute is interpreted as a QName, its value is
|>    < "http://example.org/" , "foo" >
|> whereas if it's interpreted as a CURIE, its value is
|>    "http://example.org/foo"
|> which is seriously different.
|> Different semantics, please use a different syntax!
| The semantics are in fact the same since it's only when:
|   { "http://example.org/" , "foo" }
| is interpreted by some RDF/A processor that it 'becomes' a URI. This is much
| the same as for an RDF/XML parser--you leave things as {URI, local-name} for
| as long as possible (conceptually) and only at the last moment interpret
| them as a URI.
| However, even if they were 'URIs' as such (i.e., even if there is a
| difference between 'interpretations' in the way that you describe), this
| would still not be going against the TAG finding of March 2004 [1]. I'll
| quote what is for me the key section, with my comments interspersed:

My objection (and Henry's I think) has nothing to do with the TAG
finding or the relative merits of QNames vs. URIs per se.

My concern is that you seem to be introducing a new way to define
something that is lexically indistinguishable from and conceptually
similar to a QName that may appear in contexts where QNames may

If there is any context in which this fragment could appear

   <any:Vocab xmlns:p="http://example.org/">
     <html:xxx someAttribute="p:lname"/>

and the interpretation of p:lname would not be the tuple
(http://example.org/,lname), I think that's a real problem.

                                        Be seeing you,

Norman.Walsh@Sun.COM / XML Standards Architect / Sun Microsystems, Inc.
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Received on Friday, 4 November 2005 19:53:56 UTC

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