- From: Murray Maloney <murray@muzmo.com>
- Date: Fri, 24 Nov 2006 16:46:13 -0500
- To: public-grddl-wg <public-grddl-wg@w3.org>
At 07:58 PM 11/24/2006 +0000, Ian Davis wrote: >OK, with a real property: > ><rdf:RDF > xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" > xmlns:f="http://purl.org/vocab/frbr/core#"> > > <rdf:Description rdf:about="http://example.com/authors#king"> > <f:creatorOf rdf:resource="http://example.com/books#stand" /> > </rdf:Description> ></rdf:RDF> > >You can look http://purl.org/vocab/frbr/core#creatorOf up to get a >definition. This will tell you that the subject of this triple is q >f:ResponsibleEntity (which further lookup would tell you is either a >f:CorporateBody or a foaf:Person) and the object is a f:Work > >I don't know of any URIs that represent Stephen King or his book. I know >of some that represent web pages about those things. That's interesting. Certainly an ISBN URI can relate to a manifestation of the book, but you seem to be telling me that we currently have no way to refer to an actual human being or a work -- as opposed to a particular manifestation of that work. Even so, if I were to use http://www.stephenking.com/pages/works/stand/ and http://en.wikipedia.org/wiki/Stephen_King/ , I would be able to make further assertions about either. For example, I could assert that "The Stand" has numerous ISBNs associated with it, or that Stephen King is the author of "Carrie". I could then go on to infer that "The Stand" and "Carrie" have the same author because their author properties are equivalent. >However simply by stating the RDF above I am claiming that >http://example.com/authors#king represents the creator of the resource >identified by http://example.com/books#stand which is perfectly valid. >Just because you can't get representations of those resources from those >URIs doesn't mean it's broken, inappropriate or invalid. Well, if you say so. But I don't see how to "follow my nose" to come to the conclusion that the URIs actually refer to the same Stephen King and "The Stand" that I intended to refer to. I don't see how this helps. You might just as easily say that subject="a" and object="b" and "b" is the creator of "a". >If I didn't want to assign a URI to each resource then I would use >indirection. This is where the primary topic stuff in the primer example >comes from. So, omitting the URI for the subject and using wikipedia as an >indirect reference (usual namespaces assumed): > > <rdf:Description> > <foaf:isPrimaryTopicOf > rdf:resource="http://en.wikipedia.org/wiki/Stephen_King" /> > <f:creatorOf rdf:resource="http://example.com/books#stand" /> > </rdf:Description> > >You can look http://xmlns.com/foaf/0.1/isPrimaryTopicOf up to discover >what that property means (hmmm xmlns.com appears to be unavailable today) That's OK. I had to look that up when Dan first used it. My nose was working then and I cached a partial understanding of its meaning >I could use indirection to eliminate the URI for the object. Using some >details of the frbr model (A Work is realized by an Expression which is >embodied in a Manifestation which are physical things with ISBNs and >publishers etc) > > <rdf:Description> > <foaf:isPrimaryTopicOf > rdf:resource="http://en.wikipedia.org/wiki/Stephen_King" /> > ><f:creatorOf><f:Work><f:realization><f:Expression><f:embodiment><f:Manifestation> > <foaf:isPrimaryTopicOf > rdf:resource="http://www.amazon.com/Stand-Expanded-First-Complete-Signet/dp/0451169530/" > /> > ></f:Manifestation></f:embodiment></f:Expression></f:realization></f:Work></f:creatorOf> > </rdf:Description> > >Somewhat verbose for the introduction i suspect which is why I suggested >the very first form. Yes, a bit verbose, and not simple at all. Do we really need to include all of the nested elements? Wouldn't it be sufficient to say: > <rdf:Description> > <foaf:isPrimaryTopicOf > rdf:resource="http://en.wikipedia.org/wiki/Stephen_King" /> > <f:creatorOf><f:Manifestation> > <foaf:isPrimaryTopicOf > rdf:resource="http://www.amazon.com/Stand-Expanded-First-Complete-Signet/dp/0451169530/" > /> > </f:Manifestation></f:creatorOf> > </rdf:Description> Regards, Murray
Received on Friday, 24 November 2006 21:47:01 UTC