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Re: Time-sensitive resources using RDF?

From: Lisa Seeman <lisa@ubaccess.com>
Date: Tue, 21 Dec 2004 09:43:37 +0200
To: Danny Ayers <danny.ayers@gmail.com>, Wei Xing <xing@ucy.ac.cy>
Cc: www-rdf-interest@w3.org
Message-id: <013601c4e730$f129c730$680aa8c0@IBMA4E63BE0B9E>
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
  To: Wei Xing
  Cc: 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> 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 Tuesday, 21 December 2004 07:45:46 GMT

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