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RE: A proposal to remove xsd:ENTITY, xsd:ID, and xsd:IDREF datatypes from OWL 2

From: Michael Schneider <schneid@fzi.de>
Date: Fri, 14 Nov 2008 12:55:43 +0100
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A0E066C0@judith.fzi.de>
To: "Boris Motik" <boris.motik@comlab.ox.ac.uk>
Cc: "W3C OWL Working Group" <public-owl-wg@w3.org>
Hi!

I support this proposal.

As I already said in the last telco, I would feel uncomfortable with
requiring these three datatypes as part of OWL 2 Full's datatype map, while
the RDF Semantics states that these datatypes "SHOULD NOT be used" [1].

Best,
Michael

[1] <http://www.w3.org/TR/rdf-mt/#DTYPEINTERP>

>-----Original Message-----
>From: public-owl-wg-request@w3.org [mailto:public-owl-wg-request@w3.org]
>On Behalf Of Boris Motik
>Sent: Friday, November 14, 2008 9:38 AM
>To: 'W3C OWL Working Group'
>Subject: A proposal to remove xsd:ENTITY, xsd:ID, and xsd:IDREF
>datatypes from OWL 2
>
>
>Hello,
>
>Recently, Jos de Bruijn has made a comment that the xsd:ENTITY, xsd:ID,
>and xsd:IDREF datatypes are not recommended for use in RDF
>and OWL 1. Therefore, he asked us why we included these datatypes into
>OWL 2. His original e-mail is here:
>
>http://lists.w3.org/Archives/Public/public-owl-
>comments/2008Oct/0000.html
>
>I looked into this and here are my findings. The xsd:ENTITY datatype has
>been derived from xsd:NCName by placing a rather strange
>restriction on its value space:
>
>	The value space of ENTITY is scoped to a specific instance
>document.
>
>This probably means you cannot define the value space globally, but need
>to somehow associate it with the document where xsd:ENTITY
>is being used. This is clearly quite complex and has not been intended
>in my original definition of the OWL 2 datatype map.
>
>The xsd:ID and xsd:IDREF datatypes exhibit no such problems: their value
>space is exactly the same as for xsd:NCName. Therefore, I
>am not really sure why RDF and OWL 1 warned against their usage.
>
>
>Either, I believe that the simplest way to address Jos's comment is to
>delete all three datatypes from the rdf:text and OWL 2
>specifications. Since neither of these datatypes provides us with
>something more than xsd:NCName, we are not really losing any
>expressivity here.
>
>Regards,
>
>	Boris
>

--
Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
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Fax  : +49-721-9654-727
Email: Michael.Schneider@fzi.de
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Received on Friday, 14 November 2008 11:56:25 GMT

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