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Re: Time-sensitive resources using RDF?

From: Wei Xing <xing@ucy.ac.cy>
Date: Tue, 21 Dec 2004 11:34:54 +0200
Message-ID: <41C7EE3E.90207@ucy.ac.cy>
To: Charles McCathieNevile <charles@w3.org>, Danny Ayers <danny.ayers@gmail.com>
CC: www-rdf-interest@w3.org

Dear Danny & Charles,

Many thanks for your comments and the links.

Both N-ary Relations and EARL are very interesting and very helpful.

Best regard

Wei Xing



Charles McCathieNevile wrote:

>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
>  
>


-- 
============================================================
Wei Xing, M.Sc.
Research Associate                    Tel: 00357-22892663
Dept. of Computer Science             Fax: 00357-22892701
University of Cyprus                  email: xing@ucy.ac.cy
PO Box 20537
CY1678, Nicosia, CYPRUS
Received on Tuesday, 21 December 2004 09:38:07 GMT

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