LC2 Responses/RHM1

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To: rhm@pioneerca.com
CC: public-owl-comments@w3.org
Subject: [LC response] To Richard H. McCullough

Dear Richard,

Thank you for your comment
     <http://lists.w3.org/Archives/Public/public-owl-comments/2009Apr/0066.html>
on the OWL 2 Web Ontology Language last call drafts.

In order to avoid any possible confusion we have added some text to the OWL 2 Primer that clarifies the meaning of class and the correspondence with concept (see <http://www.w3.org/2007/OWL/wiki/index.php?title=Primer&diff=23518&oldid=23517>).

As a historical remark, the use of "class" in OWL 2 comes from its prior use in related representation systems. RDF uses "class" (as opposed to "concept" or another term). The original version of OWL uses "class" to be compatible with RDF.

Please acknowledge receipt of this email to <mailto:public-owl-comments@w3.org> (replying to this email should suffice). In your acknowledgment please let us know whether or not you are satisfied with the working group's response to your comment.

Regards,
Sebastian Rudolph
on behalf of the W3C OWL Working Group



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I skimmed through the OWL2 overview and primer, and

noticed that there is no definition of "Class".

Since my first exposure to RDF/OWL in 2002, I had difficulty understanding "Class", because I automatically thought of "Concept" instead. I finally understand that

       Class is the extension set of Concept.

Now, all of the "strange" properties of "Class" are obvious, because "Class" is just a set.

Specifically, the meaning of subClassOf is subset of, not species of.

Dick McCullough http://mkrmke.org