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Re: S&AS comments

From: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
Date: Mon, 16 Jun 2003 10:30:19 -0400 (EDT)
Message-Id: <20030616.103019.119356224.pfps@research.bell-labs.com>
To: pan@cs.man.ac.uk
Cc: public-webont-comments@w3.org

Here are responses to the remaing questions from your message:

> (2) The description of the elements of VD is a bit confusing, along with
> the supported datatype described in section 2. Section 2 says a list of XML
> Schema datatypes can be used in OWL, ..., *and* OWL also uses rdfs:Literal
> and can use rdf:XMLLiteral. Section 3.1 says VD contains the URI references
> of the built-in OWL datatypes and rdfs:Literal. Thus it seems that
> rdfs:Literal and rdf:XMLLiteral are not built-in OWL datatypes, and
> rdf:XMLLiteral is not in VD (but can be in D of a datatype theory). Is that
> right?

Sections 2 and 3 have been modified to make rdf:XMLLiteral a built-in OWL
datatype and rdfs:Literal not a built-in OWL datatype.  Data ranges now
include rdfs:Literal as a special case.  VD is then the built-in OWL
datatypes plus rdfs:Literal.  This has no real effect on the semantics.
You can see the revised document at 

> (3) In the definition of datatype theory, it is not clear that what kinds
> of datatypes can be in the set D. Does it contain only the built-in OWL
> datatypes, or also their derived datatypes? If it can only consist of
> built-in OWL datatypes, the datatype theory is quite limited and seems to
> me not enough in many cases.

Datatype theories could include more than the built-in datatypes.  However,
there would have to be a private understanding as to the meaning of these
datatypes, as OWL has no mechanisms for providing such meaning.

Please let us know whether this satisfactorily addreses the last of your
comments by replying to the message, ensuring that a copy is sent to

Peter F. Patel-Schneider
Bell Labs Research
Lucent Technologies
Received on Monday, 16 June 2003 10:30:32 UTC

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