- From: Pat Hayes <phayes@ihmc.us>
- Date: Tue, 6 Jul 2010 16:11:19 -0500
- To: Dan Brickley <danbri@danbri.org>
- Cc: Linked Data community <public-lod@w3.org>, Semantic Web <semantic-web@w3.org>
On Jul 6, 2010, at 10:03 AM, Dan Brickley wrote: > 2010/7/6 Jiří Procházka <ojirio@gmail.com>: >> On 07/06/2010 03:35 PM, Toby Inkster wrote: >>> On Tue, 6 Jul 2010 14:03:19 +0200 >>> "Michael Schneider" <schneid@fzi.de> wrote: >>> >>>> So, if >>>> >>>> :s "lit" :o . >>>> >>>> must not have a semantic meaning, what about >>>> >>>> "lit" rdf:type rdf:Property . >>>> >>>> ? As, according to what you say above, you are willing to allow for >>>> literals in subject position, this triple is fine for you >>>> syntactically. But what about its meaning? Would this also be >>>> officially defined to have no meaning? >>> >>> It would have a meaning. It would just be a false statement. The >>> same as the following is a false statement: >>> >>> foaf:Person a rdf:Property . >> >> Why do you think so? >> I believe it is valid RDF and even valid under RDFS semantic >> extension. >> Maybe OWL says something about disjointness of RDF properties and >> classes >> URI can be many things. > > It just so happens as a fact in the world, that the thing called > foaf:Person isn't a property. It's a class. The world doesn't have facts like that in it. Classes and properties are intellectual constructs, not the stuff of reality. Hell, if a particle can be a wave, then surely a class can be a property. Anyway, RDF doesn't make logical a priori rulings about these kind of metaphysical segregations. For example, xsd:Number is a class, a property and an individual in RDF. Pat > > Some might argue that there are no things that are simultaneously RDF > classes and properties, but that doesn't matter for the FOAF case. The > RSS1 vocabulary btw tried to define something that was both, > rss1:image I think; but this was a backwards-compatibility hack. > > cheers, > > Dan > > ------------------------------------------------------------ IHMC (850)434 8903 or (650)494 3973 40 South Alcaniz St. (850)202 4416 office Pensacola (850)202 4440 fax FL 32502 (850)291 0667 mobile phayesAT-SIGNihmc.us http://www.ihmc.us/users/phayes
Received on Tuesday, 6 July 2010 21:12:27 UTC