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Time-sensitive resources using RDF?

From: Wei Xing <xing@ucy.ac.cy>
Date: Mon, 20 Dec 2004 11:43:12 +0200
Message-ID: <41C69EB0.3020308@ucy.ac.cy>
To: www-rdf-interest@w3.org

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.

Best regard

Wei Xing

-- 
============================================================
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 Monday, 20 December 2004 10:09:02 GMT

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