- From: Richard H. McCullough <rhm@cdepot.net>
- Date: Wed, 20 Nov 2002 04:22:54 -0800
- To: "Leonid Ototsky" <leo@mmk.ru>
- Cc: "David Menendez" <zednenem@psualum.com>, "RDF-Interest" <www-rdf-interest@w3.org>
- Message-ID: <003201c2908f$8def2ba0$bd7ba8c0@rhm8200>
I misunderstood what you were saying. In the context of your previous statements, I thought that "a member of a class" meant "John Doe". I agree that "a member of a class can be an individual or a class". I apologize for misquoting you. ============ Dick McCullough knowledge := man do identify od existent done knowledge haspart list of proposition ----- Original Message ----- From: Leonid Ototsky To: Richard H. McCullough Cc: David Menendez ; RDF-Interest Sent: Wednesday, November 20, 2002 12:02 AM Subject: Re[2]: P.S. re: two senses of Class (RDF vocabulary definiitions) Hello Richard, Wednesday, November 20, 2002, 12:34:09 PM, you wrote: RHM> Re: P.S. re: two senses of Class (RDF vocabulary definDavid RHM> Menendez and Leonid Ototsky both inform me that an Individual can be a Class. RHM> That is absolutely false. Sorry, but I said something another !!! Namely that A MEMBER of a CLASS can be an Individual Type or a CLASS type ( from the EPISTLE Core Model point of view) . But NOT that "an Individual can be a Class" (?!) Regards, Leonid RHM> Here are the definitions from the theory of epistemology, RHM> paraphrased to match the context of our current discussion. RHM> An individual is a single concrete existent. RHM> A class is an abstract group of two or more similar individuals. RHM> ============ RHM> Dick McCullough RHM> knowledge := man do identify od existent done RHM> knowledge haspart list of proposition RHM> ----- Original Message ----- RHM> From: David Menendez RHM> To: RDF-Interest RHM> Sent: Tuesday, November 19, 2002 10:52 PM RHM> Subject: Re: P.S. re: two senses of Class (RDF vocabulary definiitions) RHM> At 10:16 PM -0800 2002-11-19, Richard H. McCullough wrote: RHM> I had forgotten about the other problem with type, e.g. RHM> John Doe type person RHM> where RHM> John Doe individualOf person RHM> not RHM> John Doe subClassOf person RHM> I'm not sure what problem you're seeing. RHM> In RDF(S), the statements RHM> eg:john_doe rdf:type eg:Person. RHM> and RHM> eg:john_doe rdf:subClassOf eg:Person. RHM> are entirely independent and mean different things. RHM> My understanding of RDF-MT is that the first statement means "I(eg:john_doe) is a member of ICEXT(I(eg:Person))" while the second means "ICEXT(I(eg:john_doe)) is a subset of RHM> ICEXT(I(eg:Person))". These are distinct assertions, and either can be true without the other being true. RHM> (I(x) is the interpretation of x, and ICEXT(y) is the set of all things belonging to the class y.) RHM> If I say RHM> eg:Dog rdfs:subClassOf eg:Mammal. RHM> I am not implying RHM> eg:Dog rdf:type eg:Mammal. RHM> because that would mean that the class "Dog" is a mammal, which it is not. Individual dogs are mammals, but the set of all dogs is a set. RHM> -- RHM> Dave Menendez - zednenem@psualum.com - http://www.eyrie.org/~zednenem/ Best regards, Leonid mailto:leo@mmk.ru and copy to leo@mgn.ru ===================================================== Leonid Ototsky, http://ototsky.mgn.ru Chief Specialist of the Computer Center, Magnitogorsk Iron&Steel Works (MMK)- www.mmk.ru Russia =====================================================
Received on Wednesday, 20 November 2002 07:22:58 UTC