Re: [ontolog-forum] Last Call: OWL 2 and rdf:text primitive datatype

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
  ----- Original Message ----- 
  From: Alan Ruttenberg 
  To: ontolog-forum@ontolog.cim3.net 
  Sent: Wednesday, April 22, 2009 1:38 PM
  Subject: [ontolog-forum] Last Call: OWL 2 and rdf:text primitive datatype


  Dear Colleagues,


  The OWL Working Group has published new Working Drafts for OWL 2, a language for building Semantic Web ontologies. OWL 2 (a compatible extension of OWL 1) consists of 13 documents (7 technical, 4 instructional, and 2 group Notes). For descriptions and links to all the documents, see the OWL 2 Documentation Roadmap . This is a "Last Call" for the technical materials and is an opportunity for the community to confirm that these documents satisfy requirements for an ontology language. This is a second Last Call for six of the documents, but because the changes since the first Last Call are limited in scope, the review period lasts only 21 days. For an introduction to OWL 2, see the four instructional documents: an overview , primer , list of new features , and quick reference . 

  In addition, the OWL Working Group and the Rule Interchance Format (RIF) Working Group have jointly published a Last Call Working Draft of rdf:text: A Datatype for Internationalized Text. This datatype, compatible with XML Schema 1.1 Datatypes , is used within RIF and OWL 2 to provide support for text in various languages and scripts (identified by a BCP 47 tag such as "fr" for French). The document defines the datatype, discusses its relationship to RDF Plain Literals and the XML Schema string datatype, and specifies functions (compatible with XPath ) for operating on rdf:text data values. It also discusses how to use this feature within RDF serializations.


  I'd very much appreciate if you could review one or more documents and send your thoughts and comments to public-owl-comments@w3.org


  Regards,
  Alan Ruttenberg
  http://sciencecommons.org/about/whoweare/ruttenberg/


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