[topicmapmail] Two Models of Facets

[Murray Altheim]

Dan Corwin wrote:
> Thomas B. Passin wrote:
> 
> 
>>As probably everyone on this list knows, I consider occurrences to be 
>>well suited for property-value pairs (at least, those whose occurrence 
>>data does not point to another topic).  To my mind, the question is what 
>>is the difference, if any, between facets and other properties (or are 
>>they properties at all?).

I think I was trying to point out that there's two ways of looking
at facets:  as subject-constituting, additive components (as properties
of the class of objects whose subject is the Topic, e.g., "alligators
have lots of teeth"), or as properties of an instance of a class, e.g.,
"Allie weighs 450lbs." The general rules is that it would be (generally)
improper to assign a property of the latter category to all members of
a class.

> This pattern generalizes to cover something very similar to *both*
> Model-A characteristics and Model-T characteristics:
> 
>    http://www.lexikos.com/psi/psitree.jsp
> 
> I believe it shows they are nearly equivalent.  Also, multi-facet
> classifications can be just normal properties, as you suggest.

Dan,

I didn't follow the argument you are making. Since Models A and T
are quite different, how is it that your idea of PSI trees states
some kind of equivalence?

Murray

......................................................................
Murray Altheim                    http://kmi.open.ac.uk/people/murray/
Knowledge Media Institute
The Open University, Milton Keynes, Bucks, MK7 6AA, UK               .

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