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adding the dimension of entropy to ontologies is another angle that will be very helpful to track the changes in ontologies. but my question is little more basic to it. the question is how do we find out what domain an ontology supports, what are all the features of a particular domain its exposing.
say we want to find out the personal life of a person, then there might be dozens of ontologies that person might have his information(e.g. there might be an ontology for professional information, one for student information, one for cricket/soccer player, foaf etc. and that person might be a member of all these at some point of time). Now of all these related and many other unrelated ontologies :
a) how do we know which ontology we have to start exploring for getting the home address of a person
b) how do i know to which extent some ontology exposes the address of a person. one ontology might say only about mail address while other might say about mail address + home address.
one way that i have observed is that people generally have very deep understanding of the ontology they are working in and already know before hand where they have to find out the information (foaf in this example). this approach i don't think is scalable if we have to design that is independent of the knowledge of ontologies. If we are to write some generic query processor that is independent of the knowledge of ontology structure, then how to go about it.
i think there should be some standard way by which ontologies should publicize the domain information which they model to a very fine detail. by using this information we can find out which is the ontology we should start exploring for getting the information we need.
please let me know about what you think about this :)
On 8/29/07, Deborah MacPherson <debmacp@xxxxxxxxx> wrote:
User perspective but also user processing requirements.....evaluating ABC data for XYZ purpose using LMNOP ontology. Maybe they need to test run a few options before deciding how to proceed - which data set and ontology suits their purpose best.
The framework may not be able to capture the user's uncertainty, or assess the risk, of whether or not they are utilizing the best materials, means and methods available - except possibly to standardize and measure what is working together properly - within the framework.
Deb
On 8/29/07, paola.dimaio@xxxxxxxxx <
paola.dimaio@xxxxxxxxx > wrote:
I see what you mean.
Until now, we have discussed uncertainty (and risk also fits in here
somehow) as resulting from unknown variables that may affect the
correctness of a model over time, or under a certain condition
Here uncertainty seems to derive from the difficulty of matching one
construct (the query) which is formed based on a given cognitive model
of the user (what the user does not know and wants to find out) with
the structure of the ontology.
It is uncertainty but of a different kind. I dont think it would come
under entropy from what I see, then I wonder where would it fit in the
framework.
Probably its a 'user perspective'
I think more a perspective than a dimension perhaps
what do you think
PDM
On 8/29/07, Deborah MacPherson <
debmacp@xxxxxxxxx> wrote:
> Hi Paola -
>
> Yes, as you say below but it seems to me Ravinder also wants a way to
> recognize ontologies when they are initially encountered. Would this have to
> do with "where it fits" in the framework including its degree of
> uncertainty?
>
> Deb
>
>
> On 8/28/07,
paola.dimaio@xxxxxxxxx <paola.dimaio@xxxxxxxxx > wrote:
> > sorry, slighly amended post
> >
> > On 8/29/07, paola.dimaio@xxxxxxxxx <
paola.dimaio@xxxxxxxxx> wrote:
> > > 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') -
> > Probably also partly answers the question of why bridges fall
> > >
> > > Entropy seems to abstract quite well the principle of change, without
> > > making any prescription at this stage on how change should be
> > > modelled, 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
> > > S 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 (or more)
> > >
> > > 1.is entropy a suitable dimension to be added to the framework to
> > > summarize the discourse on change
> > > 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)
> > >
> > > 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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> > Paola Di Maio
> > School of IT
> > www.mfu.ac.th
> > *********************************************
> >
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www.mfu.ac.th
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