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Re: Time-sensitive resources using RDF?

From: Danny Ayers <danny.ayers@gmail.com>
Date: Mon, 20 Dec 2004 11:55:21 +0100
Message-ID: <1f2ed5cd041220025527dc8c19@mail.gmail.com>
To: Wei Xing <xing@ucy.ac.cy>
Cc: www-rdf-interest@w3.org

On Mon, 20 Dec 2004 11:43:12 +0200, Wei Xing <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
Received on Monday, 20 December 2004 10:55:22 GMT

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