- From: Pat Hayes <phayes@ihmc.us>
- Date: Sat, 28 Apr 2012 10:26:06 -0500
- To: David Wood <david@3roundstones.com>
- Cc: Richard Cyganiak <richard@cyganiak.de>, RDF Working Group WG <public-rdf-wg@w3.org>, Simon Reinhardt <simon.reinhardt@koeln.de>
Agreed. Pat On Apr 27, 2012, at 10:24 AM, David Wood wrote: > Thanks, Richard. I think your solution is correct. > > Regards, > Dave > > > > > On Apr 25, 2012, at 20:00, Richard Cyganiak wrote: > >> All, >> >> Simon Reinhardt spotted [1] a nice little contradiction between the 2004 versions of RDF Concepts and RDF Semantics. >> >> RDF Concepts states, in a normative section [2]: >> >> [[ >> The predicate is also known as the property of the triple. >> ]] >> >> Where “predicate” is defined as a URIref, one of the three components of a triple. RDF Semantics, on the other hand, defines [3]: >> >> [[ >> A simple interpretation I of a vocabulary V is defined by … a set IP, called the set of properties of I. >> ]] >> >> And the rest of the mechanics make it clear that URIrefs can denote a member of IP. In other words, RDF Concepts says that the predicate IRI *is* the property, while RDF Semantics says that it *denotes* the property. >> >> The analogy with classes shows IMO that RDF Concepts is wrong and RDF Semantics is right. The IRI <http://xmlns.com/foaf/0.1/Person> *is* not a class, but it *denotes* a class. >> >> I therefore deleted the normative definition quoted above from the RDF Concepts ED. If you disagree with this change or see further need to discuss this, then please respond. >> >> Note that the new Introduction section in the RDF Concepts ED contains an *informative* sentence that introduces the term “property” [4], and it is in line with RDF Semantics: >> >> [[ >> The predicate itself is an IRI and denotes a binary relation, also known as a property. >> ]] >> >> Best, >> Richard >> >> >> [1] http://lists.w3.org/Archives/Public/public-rdf-comments/2012Mar/0008.html >> [2] http://www.w3.org/TR/2004/REC-rdf-concepts-20040210/#section-triples >> [3] http://www.w3.org/TR/2004/REC-rdf-mt-20040210/#gddenot >> [4] http://dvcs.w3.org/hg/rdf/raw-file/default/rdf-concepts/index.html#dfn-property > > > ------------------------------------------------------------ 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 Saturday, 28 April 2012 15:26:43 UTC