Re: OWL Lite or DL?

Actually, I believe by virtue of being of the SHOIN family of Description 
Logics [1] that OWL-DL & RDFS can express this through role hierachies 
and transivite roles (both of which are part of [2] SHOIN: S - Role 
transitivity, H - Role hierarchy)

[1] http://www.cs.man.ac.uk/~horrocks/Publications/download/2003/HoPH03a.pdf
[2] http://www.cs.man.ac.uk/~ezolin/logic/complexity.html

I.e., instead of

:worksFor :transitiveOver :consistsOf.

you would have

:consistsOf rdf:type owl:TransitiveProperty
:worksFor rdfs:subPropertyOf :consistsOf

Which would result in the same conclusions via a reasoner 
following the axiomatic semantics of owl:TransitiveProperty and 
rdfs:subPropertyOf (in N3):

{?P a owl:TransitiveProperty. ?X ?P ?O. ?S ?P ?X} => {?S ?P ?O}.
{?P rdfs:subPropertyOf ?R. ?S ?P ?O} => {?S ?R ?O}.

Chimezie Ogbuji
Lead Systems Analyst
Thoracic and Cardiovascular Surgery
Cleveland Clinic Foundation
9500 Euclid Avenue/ W26
Cleveland, Ohio 44195
Office: (216)444-8593
ogbujic@ccf.org

On Tue, 22 Aug 2006, Internet Business Logic wrote:

>
> Larry --
>
> On the other hand... There are really simple problems that cannot be computed 
> in *any* version of OWL.
>
> I believe that "transitive over" [1] is one such.
>
> HTH,  -- Adrian
>
> [1]   http://www.reengineeringllc.com/demo_agents/TransitiveOver1.agent
>
> -- 
>
> Internet Business Logic (R)
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