>Hi Deb
>
>Thanks for forwarding Ravinders question.
>You mean its similar to my question about how to go about adding new
>dimensions to the framework?
>
>The suggestion of adding 'entropy' to the framework comes from the
>discussions around which there seems to be some agreement, that
>ontologies should model 'change' - from simple change of usage of
>words and terminologies during time, to the more complex changes of
>states of entities, to the more ambitious modelling of 'unknown
>variables'
>briefly touched upon in a discussion with Ed (have a generic class of
>'unpredictable' random variables in any ontological model to represent
>at least symbolically 'uncertainty')
>
>Entropy seems to abstract quite well the principle of change, (01)
Sorry, I strongly disagree. Change and entropy
are completely different ideas. They are related
by the thermodynamic theorems, but those apply
only in carefully controlled conditions (closed
systems, etc.) and are not a good basis for
general ontology work (for example, they do not
apply to the Internet as a whole, which consumes
vast amounts of energy). In any case there are
many kinds of change which are not related to
thermodynamics. Change is related to time, not
entropy. For a (now quite old) survey, see
http://www.ihmc.us/users/phayes/TimeCatalog.pdf (02)
>without
>making any prescription at this stage on how change should be
>modelled (03)
Good idea, although one should be aware that this
is one topic on which ontologists have probably
spent more effort and thought than any other, so
it is hardly a blank slate. (04)
>, which probably depends on the domain being addressed.
>The current (hm, yesterday morning asia pacific time) entry on
>wikipedia gives a good enough introduction, with a clear reference to
>E in information theory
>
>http://en.wikipedia.org/wiki/Entropy
>
>The less organzeds is a system the higher its entropy - lots of
>changes going on in the web
>
>
>So maybe I was thinking of 2 questions
>
>1.is entropy a suitable dimension to be added to the framework to
>summarize the discourse on change (05)
No. (06)
>2. how do we 'change' the framework over time? (that matches both 1,
>as well as Ravindra's problem - which maybe others can address
>separately) (07)
I don't think Ravindra's problem is directly
related to change at all: he is more concerned
with the multitude of ontologies all of which
conceptualise things differently and to which he
wants to apply global queries. He is simply out
of luck: what he wants to do (using SPARQL) is
not feasible in the current state of the art. (08)
Pat (09)
>Cheers
>
>PDM
>
>
>
>On 8/29/07, Deborah MacPherson <debmacp@xxxxxxxxx> wrote:
>> Hi Paola,
>>
>> Please see the message below forwarded from Ravinder Thakur on
>> Linking-open-data at MIT. Will his problem be addressed in the framework?
>> Does anyone have suggestions for Mr. Thakur and his collaborators at linking
>> open data?
>>
>> Thank you,
>>
>> Deborah
>>
>> Deborah L. MacPherson
>> Projects Director, Accuracy&Aesthetics
>> Specifier, WDG Architecture PLLC
>>
>> ---------- Forwarded message ----------
>> From: "Ravinder Thakur" < ravinderthakur@xxxxxxxxx>
>> To: "Linking Open Data" <linking-open-data@xxxxxxxxxxxxxx >
>> Date: Sun, 26 Aug 2007 22:18:09 -0700
>> Subject: [Linking-open-data] RDF/SPARQL and consistent metadata about
>> content/structure of ontologies
>>
>> Hi,
>>
>> For the past few days i have been trying to look at RDF/SPARQL from query
>> designing point of view. What basically i have been trying to do is to take
>> very simple /user/ queries ("e.g. Bill Gates net worth") and try to see if i
>> can automatically create the corresponding queriers in SPARQL. The versatile
>> nature of domain of data stored in RDF means that data from every domain
>> would have its own ontology. And the knowledge/understanding of ontology is
>> very much prerequisite to understanding the data based on that particular
>> ontology.
>>
>> This seems a little bit of problem to me. This means that we cannot build
> > queries until we know that structure of ontologies and since there might be
>> thousands of ontologies how are we supposed to know about all the
>> ontologies. Moreover everyday new ontologies will be added to the web.? IS
>> the assumption that the dust will settle after some time and we will have
>> only very few good ontologies about the world ? This seems highly
>> restrictive to me.
>>
>> Obviously I want to write a query processor that is independent on the
>> ontology that the data i am looking on is based upon. I don't want to know
>> pre hand what ontology might correspond to the data i am looking . What i am
>> looking for some consistent way to represent the /METADATA/ about the
>> structure and content about ontologies so that from the metadata about the
>> ontology, i can automatically know about the structure and relevance of the
>> ontology for the query i have in hand.
>>
>> Has anybody faced the problem i have highlighted ? or what i am saying is
>> stupid :) and there is some simple way out there ?
>>
>> Thanks
>> Ravinder Thakur
>>
>>
>> On 8/27/07, paola.dimaio@xxxxxxxxx < paola.dimaio@xxxxxxxxx> wrote:
>> >
>> > When is the next update of the framework due?
>> > I propose we add 'entropy' as a new dimension
>> >
>> > Do I have to write something up? Or are the discussions so far on the
>> > need to model
>> > 'change' sufficient?
>> >
>> >
>> > --
>> > Paola Di Maio
>> > School of IT
>> > www.mfu.ac.th
>> > *********************************************
>> >
>> >
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>>
>> On 8/27/07, paola.dimaio@xxxxxxxxx <paola.dimaio@xxxxxxxxx> wrote:
>> >
>> > When is the next update of the framework due?
>> > I propose we add 'entropy' as a new dimension
>> >
>> > Do I have to write something up? Or are the discussions so far on the
>> > need to model
>> > 'change' sufficient?
>> >
>> >
>> > --
>> > Paola Di Maio
>> > School of IT
>> > www.mfu.ac.th
>> > *********************************************
>> >
>> >
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>>
>>
>>
>> --
>> *************************************************
>> Deborah L. MacPherson
>> Projects Director, Accuracy&Aesthetics
>> Specifier, WDG Architecture PLLC
>>
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>
>
>--
>Paola Di Maio
>School of IT
>www.mfu.ac.th
>*********************************************
>
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