Re: SKOS Comment (Reference WD June 2008) - broaderTransitive < broader, narrowerTransitive < narrower

Ooops - gmail and tabs bite me once again:

car_wheel BTP car
car BTG wheeled_vehicle
wheeled_vehicle BTG vehicle
-----------------------------------
car_wheel BT car
                 BT wheeled_vehicle
                 BT vehicle
car            BT wheeled_vehicle
car            BTG vehicle
wheeled_vehicle BT vehicle

Where BT is the broader relationship between subjects, as described by
Svenonius, Soergel, Green, Milstead, Taylor, etc.    Soergel's treatment of
pre-combination and poly-hiearachy is especially informative.

The BTG relationship allows additional inferences to be made about
relationships between  classes of things that are described by those subject
terms.  This  is the traditional subclass relationship.  Correctly declared
BTG relationships can be used to infer corresponding OWL/RDFS ontologies in
a fairly obvious way.  The mapping for BTI is also fairly clear.

BTP can also be mapped somewhat simply, but possibly with a restricted
semantics that require specialization.

If a current KOS defines a relationship  between terms where A *R* B and B *
R* C , but not A *R* C,   *R* *doesn't* correspond to BT.
By definition, the relationship is an associative one.  The correct way to
map these relationships into SKOS is as a (possible subrole of)  *related*.