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Re: Time-sensitive resources using RDF?

From: Wei Xing <xing@ucy.ac.cy>
Date: Tue, 21 Dec 2004 11:35:01 +0200
Message-ID: <41C7EE45.4020209@ucy.ac.cy>
To: Lisa Seeman <lisa@ubaccess.com>
CC: Danny Ayers <danny.ayers@gmail.com>, www-rdf-interest@w3.org

Dear Lisa,

Many thanks for your response.

I would be very grateful if you can show me an example of your RDF 
code.  Can also possible please provide me some links to the papers (or 
applications)  about your work?  Thanks.

Best regard

Wei Xing

Lisa Seeman wrote:

> Hi Danny,
>  
> I have been looking into representing time-sensitive resources using 
> RDF , but for a very different application - multi media resources.
> What we have been doing is regarding a element in a resource that 
> changing over time as being part of our description of the possible 
> states of the resource, where time is a contrition that affects 
> state,  and state in turn effects or acts as a condition type property 
> to every other value/ property of the element
>  
>  
> I have no idea if this is at all helpful, but it may be interesting 
> metaphor for what you are doing
>  
> Keep well
> Lisa Seeman
>
>     ----- Original Message -----
>     *From:* Danny Ayers <mailto:danny.ayers@gmail.com>
>     *To:* Wei Xing <mailto:xing@ucy.ac.cy>
>     *Cc:* www-rdf-interest@w3.org <mailto:www-rdf-interest@w3.org>
>     *Sent:* Monday, December 20, 2004 12:55 PM
>     *Subject:* Re: Time-sensitive resources using RDF?
>
>
>     On Mon, 20 Dec 2004 11:43:12 +0200, Wei Xing <xing@ucy.ac.cy
>     <mailto:xing@ucy.ac.cy>> wrote:
>     >
>     > Dear all,
>     >
>     > 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).
>     >
>     > My way, to describe a "Cluster" using RDF/S, can be descibed as
>     follows:
>     > First, I describe the "Cluster" using reification, i.e. attaching a
>     > constraint (valid only for the year 2004) to the Cluster. 
>     Second,  I
>     > descibe its properties, e.g. network bandwidth (at the testing
>     moment)
>     > using a 4-tuple format ({Subject, Predicate, [Object,
>     timestamp]}).  The
>     > RDF  metadata is shown as follows:
>     > ....
>     > <rdf:Description>
>     >    <rdf:subject 
>     rdf:resource="http://grid.ucy.ac.cy/someCluster1" />
>     >    <rdf:predicate
>     >
>     rdf:resource="http://grid.ucy.ac.cy/2003/12/GrisenSchema#bandWidth" />
>     >    <rdf:object >
>     >             <rdf:Seq>
>     >                    <b> 125Mbits  </b>
>     >                    <t>   200412201023 </t>
>     >             </rdf:Seq>
>     >    </rdf:object>
>     >     ......    <rdf:type  rdf:resource =
>     > "http://www.w3.org/1999/02/22-rdf-syntax-ns#statement" />
>     >    <grisen:validFor> 2004 </grisen:validFor>
>     > </rdf:Description>
>     > ....
>     >
>     > 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
>


-- 
============================================================
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 09:38:16 GMT

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