- From: Charles McCathieNevile <charles@w3.org>
- Date: Mon, 20 Dec 2004 08:13:24 -0500 (EST)
- To: Danny Ayers <danny.ayers@gmail.com>
- Cc: Wei Xing <xing@ucy.ac.cy>, www-rdf-interest@w3.org
Wei Xing, I think your way is OK (again, a quick response). This problem was faced in developing EARL [1], which essentially describes whether a resource conforms to a requirement. In most of the use cases, the thing that was being assessed could change. So the conformance would change over time. For some time it had a similar approach, to yours. More recently the structure changed, so that there were Assertions, which had various properties including the result of the test (the conformance statement itself) and the time it was done. Comparing results then involves checking that the result you mean is relevant at the time you are talking about (normally, that it is the most recent). One of the things that EARL does not use at the moment is a datatype for dates (when the last draft was written datatypes were not part of RDF) but this should be used, in my opinion. As Danny says, the draft note about n-ary relations covers this case among others. cheers Chaals [1] http://www.w3.org/TR/EARL10 (yes, the schema doesn't validate - tehre are some typos in it. You might find that http://www.w3.org/2001/sw/Europe/talks/200311-earl/all explains it in simpler form for someone who can read RDF). On Mon, 20 Dec 2004, Danny Ayers wrote: > >On Mon, 20 Dec 2004 11:43:12 +0200, Wei Xing <xing@ucy.ac.cy> wrote: >> Does anybody have the experience of representing time-sensitive >> resources using RDF/S? In particular, for the time-sensitive properties? >> >> I am trying to describe some time-sensitive resources using RDF/S, of >> which the values (Object) of the properties (Predicate) are changed from >> time to time, for instance, a computer cluster (the network bandwidth >> and the free CPUs number of the cluster are dynamical). [snip] >> Not sure if my way is OK? Is there another way that allows me to >> describe such property and its value using RDF without conflicting the >> exsiting RDF recommendation? >> >> I appreciate any comments and suggestions on it. > >(Sorry, very quick response) Your basic modelling approach (the >4-tuple) looks ok, but I'm not sure about the representation in RDF >(/XML). This may be helpful: > >http://www.w3.org/TR/swbp-n-aryRelations/ > >Cheers, >Danny. > >-- > >http://dannyayers.com > Charles McCathieNevile http://www.w3.org/People/Charles tel: +61 409 134 136 fax(france): +33 4 92 38 78 22 Post: 21 Mitchell street, FOOTSCRAY Vic 3011, Australia or W3C, 2004 Route des Lucioles, 06902 Sophia Antipolis Cedex, France
Received on Monday, 20 December 2004 13:13:25 UTC