RE: Re: Facet algebra

Yannis,

I need a bit of help in understanding the scope of 'compound terms
composition algebra'.

In managing facetted classification schemes there are three kind of rules
that needs to be encoded
properly (apropriate data binding).

-facet citation order rule (the order of facets in compound term to achieve
horizontal order with
decending concretness)
-filing order rules (the order compounds terms when they are filed to
achieve the hierarchy in
knowledge display: general to specific)
-restriction on synthesis and rules on combination between facets
(the areas of application of certain facets)

(NB I am not talking here about encoding semantic relationships that are
dealt with on the level of facet
itself)

While the first two rules are traditionally solved with appropriate 'facet
indicators' in classification notation,
followed by appropriate data coding of this notation, the last one needs a
special attention.
This is something that is usually  'handed over' to the application or tool
itself
(program memory) and I have never seen it coded on the level of
classification data.

Am I right to think that 'compound terms composition algebra' takes care
about all of these rules?
Does it provide solutions for data encoding as well (e.g. for the the
purpose of classification
exchange and sharing between different applications).


Aida


-----Original Message-----
From: yannis_tzitzikas [mailto:[email protected]]
Sent: 01 September 2003 08:34
To: [email protected]
Subject: [facetedclassification] Re: Facet algebra


Dear  Claudio,

   I agree with you that a compound term that has an empty extension
does not necesarilly  describes something invalid or impossible.
So if one wants to get ... fruitful new ideas then he does not have
to use the Compound Terms Composition Algebra.  If on the other hand
one wants to build an information base using a faceted taxonomy and
make object indexing easy and error-free, then the Compound Terms
Composition Algebra  is (according to my opinion) the most well-
defined and powerful tool  that we have now.

Ciao,

Yannis

--- In [email protected], Claudio Gnoli
<gnoli@a...> wrote:
> / Claudio Gnoli --> "Faceted classification discussion"
>
> On July 19, Yannis Tzitzikas presented to this list his work
> on coding a "compound terms composition algebra", prescribing
> which combinations of facets are legal and which ones are
> illegal: EG, of
>
>    Greece : sea sports
>    Austria : sea sports
>
> only the first one makes sense and hence it is legal.
>
> On the other hand, an interesting paper by Joe Tennis
>
<http://students.washington.edu/jtennis/Tennis_three_spheres_2002.pdf>
> says:
> "In classification, when symbols of concepts are placed
> into interrelationship with one another, gaps emerge. This has
> been discussed in the literature as well. Barbara Kwasnik (1992)
> discusses the role of classification schemes in shaping theory.
> She uses the periodic table as one such structure that was
> able to cast light on questions in the weight of elements.
> Foskett (1991) poses a similar set of questions to specialized
> classification schemes. In a faceted classification scheme
> he argues, combining facets not yet combined in your collection
> would point to gaps in the research field, and therefore
> constitute topics for further research."
>
> So I wonder, how can we know which combinations are nonsense
> and which ones are fruitful new ideas? Of course our aim is not
> to excavate a marine basin in Vienna (I hope)... But must we find
> out fruitful combinations just by trying each of them? Is there
> any feature of Yannis's project dealing with this?...
>
> Thanks.


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