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Re: [ontolog-forum] [Obo-relations] Heterarchy & Hierarchy, oh my my

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Ryan Kohl <kohl@xxxxxxxxxxxxxxxxx>
Date: Fri, 02 May 2008 15:59:13 -0400
Message-id: <481B7291.4000806@xxxxxxxxxxxxxxxxx>
Why wouldn't 'married man' be a universal?  By most standard ontological 
definitions, a universal is something that can be instantiated by more 
than one thing (e.g. http://plato.stanford.edu/entries/properties/).  
Even under Barry Smith and Pierre Grenon's definition (from 
http://ontology.buffalo.edu/bfo/SQU.pdf), a universal "is an entity with 
a spatiotemporal existence which is yet distinct from its extension (the 
set of its instances) at any given time." (page 1, 2nd paragraph).  What 
am I missing here?    (01)

> BFO and OBO aim for representation that is faithful to reality, not for 
> computational efficiency or "easyness" of reasoning.
> BFO for sure, and good OBO ontologies (there are not many yet) represent 
> universals. The monohierarchy applies to universals. "married man" does not 
> denote a universal, so would never be present in a good OBO ontology.
> If there are places in OBO ontologies where the priority of distinction is 
> an issue, then that probably is a place where some mistake against the "only 
> universals" rule is made. Better to correct such mistakes, than to relax the 
> principles.
> If you want to have "married man" in some application ontology (in contrast 
> to reference ontologies as BFO and what OBO ontologies ought to be), then it 
> could go there as a defined class, defined on the basis of the universals 
> "man" and "marriage".
> w
>       (02)

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