- From: Dan Connolly <connolly@w3.org>
- Date: 16 Dec 2002 09:40:07 -0600
- To: Graham Klyne <GK@NineByNine.org>
- Cc: www-rdf-calendar <www-rdf-calendar@w3.org>
I hope to reply in substance presently, but I'm not sure I'll be able to... On Sun, 2002-12-15 at 07:33, Graham Klyne wrote: [...] > It seems that, using RDF, it is difficult to construct usage scenarios in > which adding additional properties can be used to refine the precision of > what is specified. To do that requires a form of default reasoning, which > is non-monotonic. > Indeed, this is a recurring issue; I'm working on proving that my new calendar knows everything my old calendar knew, and I'm wrestling with this issue; in particular, I have rules ala IF it's an event with a date-time and timezone, do x ELSE do Y well, I can't tell that it's *not* an event with a date-time based on lack of information. I'm using log:notIncludes to do it. More later, I hope. > I'm left thinking that some practical guidelines are required to avoid such > potential problems in general RDF use. > -- Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Monday, 16 December 2002 10:40:22 UTC