facets

Hello all,

I am interested in the topic of facets and faceted classification. 
I've read a bunch of articles on these topics but found no crisp 
definition. Below I list what I have accumulated so far, and I would 
highly appreciate some feedback from the group:

-	A facet is the domain of a property (or attribute) of an 
object. For instance, if we classify scientific articles, then a 
facet might comprise years of publication or types of conferences 
(AI, IR, etc);
-	Facets must be mutually disjoint as years and conference 
types in the previous item. There may not be two facets where one is 
decades and another is years;
-	A facet itself may be represented at different level of 
detail, for instance it can be a taxonomy. As from the previous 
item, the structure of a facet may not contain other facets 
considered together for a given classification. An example is a food 
taxonomy for the "main ingredient" attribute in a classification of 
a French cuisine;
-	When browsing the user may start with any facet (e.g., 
select year of conferences), then proceed to any other, and so on 
until required combination of facets' values is reached. This is 
different from standard taxonomic classifications where browsing is 
always done top down (from most general to most specific category).

Thank you
Ilya 





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