- From: Jim Hendler <hendler@cs.rpi.edu>
- Date: Sun, 25 Nov 2007 12:16:27 -0500
- To: Alan Ruttenberg <alanruttenberg@gmail.com>
- Cc: public-owl-wg@w3.org (OWL Working Group WG <public-owl-wg@w3.org>), foaf-dev@lists.foaf-project.org
- Message-Id: <F9FACC92-D250-4A5F-B653-E611DA1C40CC@cs.rpi.edu>
FWIW, my impression is that a solution for simple datatypes (strings, integrers, literals) would go a long way - in the groups I work with, the two main reason things are in Full are the use of rdfs;class, which we've discussed elsewhere, and this (and not typing external references, but it seems like most OWL tools fix that). On Nov 25, 2007, at 12:05 PM, Alan Ruttenberg wrote: > > On Nov 25, 2007, at 11:37 AM, Jim Hendler wrote: > >> Alan, >> Forgive me for disagreeing > > With the ifdt, ok. I said I wasn't holding my breath. What about > the other stuff? > > With respect to that issue, there are a couple of things. First, I > think the chatid properties need to be reworked. They need to be > extensible - there ought to be a way to add a new chat service, an > id in that service, and to be able to look up some information > about how to connect. For example, there is no standard way to add > a skype id currently. > > That leaves only the foaf:mbox_sha1sum. Currently, the range is > rdfs:Literal. This seems wrong - I expect that all clients expect > it to be a string. It certainly can't be an xsd:float, which is > licensed by this range. > > It seems to me that OWL-DL could handle the special case of > InverseFunctional string datatype properties by treating them as > individuals named within a reserved namespace, and considering > these properties to be in a class like "simple" properties, which > disallowed any other constructs that could result in the range of > the property becoming finite. > > Essentially, DatatypeProperty(foo range(xsd:string) > InverseFunctional) creates an additional, internal hidden property > > ObjectProperty(*foo range(owl:stringObject) InverseFunctional) and > > Individual(bar value(foo "12345")) generates an additional fact > > Individual(bar value(foo <http://owl/stringobject/12345>)) > > Although this doesn't solve if datatypes in general, it would, I > think, solve the problem for the 50M or so foaf files, and > countless others that want *really simple* keys. > > -Alan > >> , but the solution is for OWL DL to figure out how to deal with >> inverseFunctional datatypes, not to refit the 50M or so FOAF files >> out there with "objects" that are really datatypes and should be >> datatypes - this issue was the one that split OWL DL from OWL FULL >> in the Owl 1.0 group, and remains unresolved. I know there has >> been work in the DL community on providing "key" functionality, >> and Evren Sirin had a usable handling of it in his thesis work, >> but as best I can read the OWL 1.1 specs, it doesn't seem to have >> made it in. >> -JH >> >> >> On Nov 23, 2007, at 8:45 PM, Alan Ruttenberg wrote: >> >>> >>> For foaf, foaf-a-matic(http://www.ldodds.com/foaf/foaf-a-matic) >>> writes >>> >>> <foaf:workplaceHomepage rdf:resource="http:// >>> sciencecommons.org/"></foaf:workplaceHomepage> >>> >>> The species validator considers this OWL Full because >>> >>> Untyped Individual: Assuming http://sciencecommons.org/ is an >>> individual >>> >>> Elsewhere, we have that the domain of foaf:workplaceHomepage is >>> foaf:Document >>> >>> To get this to validate as DL(*) I need to >>> >>> <foaf:workplaceHomepage><owl:Individual rdf:about="http:// >>> sciencecommons.org/"/></foaf:workplaceHomepage> >>> >>> This is an annoying bit of incompatibility with RDF. Any way to >>> fix it? >>> >>> -Alan >>> >>> (*) If the foaf ontology were itself valid as OWL DL. >>> >>> It's not that far off... >>> >>> Invalid Range Restriction: foaf:myersBriggs (ObjectProperty) has >>> rdfs:range rdfs:Literal (Datatype) >>> (looks like a foaf bug - foafers: take note) >>> >>> Invalid SubProperty Axiom: rdfs:subPropertyOf is used with >>> foaf:name (DatatypeProperty) and rdfs:label (AnnotationProperty) >>> (seems this could be handled on the OWL side - harm from the >>> subproperty going the other way, but not from Object/Datatype >>> property up to Annotation...) >>> >>> Multiple Types: Resource foaf:icqChatID is defined both as >>> DatatypeProperty and as InverseFunctionalProperty >>> Multiple Types: Resource foaf:jabberID is defined both as >>> DatatypeProperty and as InverseFunctionalProperty >>> Multiple Types: Resource foaf:yahooChatID is defined both as >>> DatatypeProperty and as InverseFunctionalProperty >>> Multiple Types: Resource foaf:msnChatID is defined both as >>> DatatypeProperty and as InverseFunctionalProperty >>> Multiple Types: Resource foaf:aimChatID is defined both as >>> DatatypeProperty and as InverseFunctionalProperty >>> Multiple Types: Resource foaf:mbox_sha1sum is defined both as >>> DatatypeProperty and as InverseFunctionalProperty >>> >>> All of these could be reasonably handled by making them objects. >>> I won't hold my breath. For all but the sha1sum, it seems there >>> is a reasonable analogy to mailto: >>> >>> -Alan >>> >>> ps. foafers: the link named foaf-dev@lists.foaf-project.org on >>> http://xmlns.com/foaf/spec/ is to http://lists.foaf-project.org/ >>> mailman/listinfo rather than to the expected mailto:foaf- >>> dev@lists.foaf-project.org >>> >>> >>> >> >> "If we knew what we were doing, it wouldn't be called research, >> would it?." - Albert Einstein >> >> Prof James Hendler http://www.cs.rpi.edu/~hendler >> Tetherless World Constellation Chair >> Computer Science Dept >> Rensselaer Polytechnic Institute, Troy NY 12180 >> >> >> >> > "If we knew what we were doing, it wouldn't be called research, would it?." - Albert Einstein Prof James Hendler http://www.cs.rpi.edu/~hendler Tetherless World Constellation Chair Computer Science Dept Rensselaer Polytechnic Institute, Troy NY 12180
Received on Sunday, 25 November 2007 17:17:04 UTC