- From: Peter F. Patel-Schneider <pfpschneider@gmail.com>
- Date: Mon, 21 May 2012 04:43:12 -0400
- To: Ivan Herman <ivan@w3.org>
- CC: Pat Hayes <phayes@ihmc.us>, W3C RDF WG <public-rdf-wg@w3.org>
yes On 05/21/2012 04:35 AM, Ivan Herman wrote: > Pat, Peter, > > Michael's question was actually the firs bullet point below; I think we have an agreement on that one and we can answer him accordingly. Is that correct? > > I agree on your course of action for XMLLiteral (which would also apply to rdf:HTML, in fact, if accepted by the WG) > > Ivan > > > On May 19, 2012, at 17:38 , Pat Hayes wrote: > >> On May 19, 2012, at 10:28 AM, Ivan Herman wrote: >> >>> Peter, >>> >>> this mail arrived as a question to your question, and I would like to answer it. I think that: >>> >>> - yes, duration would just be 'added' to the list but there is no planned change on the 'status' of these types regarding the RDF semantics. >>> - actually, though not related to duration: would the fact that XMLLiteral becomes optional mean that D-entailment would not refer to this any more? >> It would refer to it, but it would be listed along with the XSD suite as being optional (part of a D) rather than built into RDF entailment. Yes, this should affect OWL and other entailment regimes which are built on RDF. I think it will make them easier, or else they are free to state that this datatype is built into OWL. Either way, something changes, if only editorial. >> >> We could help with this by saying that semantic extensions MAY choose to treat XMLLIteral as a built-in datatype. That lets them off the hook editorially. But we should check with them. >> >> Pat >> >> >>> If so, does that affect OWL 2 and RIF? >>> >>> Thanks >>> >>> ivan >>> >>> Begin forwarded message: >>> >>>> Resent-From: public-owl-wg@w3.org >>>> From: Michael Schneider<schneid@fzi.de> >>>> Subject: Re: status of xsd:duration in RDF >>>> Date: May 9, 2012 20:49:14 GMT+02:00 >>>> To: "Peter F. Patel-Schneider"<pfpschneider@gmail.com> >>>> Cc: "public-owl-wg@w3.org"<public-owl-wg@w3.org>, Ian Horrocks<ian.horrocks@cs.ox.ac.uk>, "Public-Rif-Wg (E-mail)"<public-rif-wg@w3.org> >>>> Archived-At:<http://www.w3.org/mid/4FAABC2A.80708@fzi.de> >>>> List-Id:<public-owl-wg.w3.org> >>>> >>>> Hi Peter! >>>> >>>> Am 09.05.2012 17:09, schrieb Peter F. Patel-Schneider: >>>>> Regardless of whether xsd:duration can make it into OWL 2, there is a >>>>> question of whether anyone in this group knows of any reason why >>>>> xsd:duration should not be added to RDF by the current RDF WG, aside >>>>> from a desire to have the datatypes in OWL match those in RDF. >>>>> >>>>> Any comments? >>>> Two questions (with some implicit answers to your question): >>>> >>>> 1) What other datatypes are under consideration by the RDF WG to be "added to RDF"? There are a lot of datatypes being mentioned in the original RDF standard, which were not taken into account by the OWL 2 and RIF specs, such as xsd:gYear, xsd:gMonthDay, xsd:gDay, xsd:gMonth. So, one could argue, if these datatypes are going to be added to RDF (again), why should we (the OWL WG) then care about xsd:duration? It'll be then just yet another datatype that is in RDF but not in OWL 2 and RIF. >>>> >>>> 2) What does "adding to RDF" precisely mean? Mentioning the datatype somewhere in the spec by its name? Or making it a normative part of the RDF semantics? In RDF 1, the definitions of RDF-, RDFS- and D-interpretations only contained rdf:XMLLiteral as a normative part. There was one specific datatype map being mentioned in the chapter on D-entailment, called the "XSD datatype map" (the one with the non-OWL2 datatypes mentioned above), but it was not an official part of the semantics of any D-interpretation (as many people seem to believe), but was just a well-known datatype map, an example for how a "D" could look like (perhaps a "primus-inter-pares D", but not more). If "adding to RDF" is meant that way, then I would *not* care much, whether xsd:duration is included in the new version of the XSD datatype map or not. If, however, it is meant to become (together with its friends from the XSD datatype map) a normative part of any D-interpretation (which would be a big step from RDF 1), then I would care *much*, because any OWL 2 RDF-Based interpretation is a D-interpretation, and if all D-interpretations would include all the XSD datatypes from the RDF spec (plus, maybe, xsd:duration), this would mean that future OWL-N Full reasoners would have to support them all, which is quite a bit more than what OWL 2 Full reasoners are expected today (with possible implementation trouble here and there)! (To be mentioned: Most probably, this would then only be an issue for OWL N Full, not OWL N DL, as for current OWL 2 DL, the semantics and, in particular, the set of to-be-supported datatypes is specified independently from the RDF semantics specification). >>>> >>>> So far from my slightly RDF-Based/OWL Full-centric point of view. >>>> >>>> Best, >>>> Michael >>>> >>>> -- >>>> ......................................................... >>>> Dipl.-Inform. Michael Schneider >>>> Research Scientist, IPE / WIM >>>> >>>> FZI Forschungszentrum Informatik >>>> Haid-und-Neu-Str. 10–14 >>>> 76131 Karlsruhe, Germany >>>> Tel.: +49 721 9654-726 >>>> Fax: +49 721 9654-727 >>>> >>>> michael.schneider@fzi.de >>>> www.fzi.de >>>> >>>> ......................................................... >>>> Forschungszentrum Informatik (FZI) an der Universität Karlsruhe >>>> Stiftung des bürgerlichen Rechts >>>> Stiftung Az: 14-0563.1 Regierungspräsidium Karlsruhe >>>> Vorstand: Dipl. Wi.-Ing. Michael Flor, Prof. Dr. Ralf Reussner, >>>> Prof. Dr. Rudi Studer, Prof. Dr.-Ing. J. Marius Zöllner >>>> Vorsitzender des Kuratoriums: Ministerialdirigent Günther Leßnerkraus >>>> ......................................................... >>>> >>> >>> ---- >>> Ivan Herman, W3C Semantic Web Activity Lead >>> Home: http://www.w3.org/People/Ivan/ >>> mobile: +31-641044153 >>> FOAF: http://www.ivan-herman.net/foaf.rdf >>> >>> >>> >>> >>> >>> >>> >> ------------------------------------------------------------ >> IHMC (850)434 8903 or (650)494 3973 >> 40 South Alcaniz St. (850)202 4416 office >> Pensacola (850)202 4440 fax >> FL 32502 (850)291 0667 mobile >> phayesAT-SIGNihmc.us http://www.ihmc.us/users/phayes >> >> >> >> >> >> > > ---- > Ivan Herman, W3C Semantic Web Activity Lead > Home: http://www.w3.org/People/Ivan/ > mobile: +31-641044153 > FOAF: http://www.ivan-herman.net/foaf.rdf > > > > >
Received on Monday, 21 May 2012 08:43:48 UTC