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.
----- Original Message -----
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@xxxxxx
Regards,
Alan Ruttenberg
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