RE: Last call comment - conformance/datatype map

>-----Original Message-----
>From: public-owl-wg-request@w3.org [mailto:public-owl-wg-request@w3.org]
>On Behalf Of Alan Ruttenberg
>Sent: Tuesday, February 24, 2009 7:51 AM
>To: W3C OWL Working Group
>Subject: Last call comment - conformance/datatype map
>
>I believe that it is our intention that implementation specific
>datatype maps don't define behavior for, e.g. future datatypes added
>to XML Schema (or datatypes we have rejected). AFAIK, there is no
>proscription against this and I would like to have there be.
>
>-Alan

I am *against* explicitly forbidding any datatypes.

The RDF Semantics (D-Entailment = RDFS + datatype maps, to be more precise)
does not explicitly disallow any datatypes, and the same is true for both
OWL 1 Full and OWL 1 DL. I understand this to be intended: These languages
just define a core set of datatypes, and a basic framework which allows
implementers to add arbitrary custom datatypes, whenever this is useful for
them.

Disallowing datatypes would mean for an implementer who currently sells an
RDF or OWL 1 system with some of the datatypes we forbid in OWL 2, that he
cannot upgrade his system to an OWL 2 conformant system without removing the
"bad" datatypes. This will hardly be acceptable for such an implementer and
his customers.

Michael

--
Dipl.-Inform. Michael Schneider
Research Scientist, Dept. Information Process Engineering (IPE)
Tel  : +49-721-9654-726
Fax  : +49-721-9654-727
Email: schneid@fzi.de
WWW  : http://www.fzi.de/ipe/eng/mitarbeiter.php?id=555

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