Perhaps the Dbpedia Ontology is restricted to OWL Lite, but I'd
really like to see some disjointWith statements in it -- I've put the
equivalent information in my system.
One issue is that the top categories tend to be mutually exclusive:
although you can be an Actor, an Athlete and a Politician, you can't
be both a Person and a Place at the same time. I think generally the
things that are derived from owl:Thing are disjoint, I mean you can't
be a SupremeCourtOfTheUnitedStatesCase and a AnatomicalStructure at the
same time. Maybe there are cases, however, where people conflate an
Organization and a Place.
I can think of a few places where disjointness would also be useful
below the toplevel: for instance, under Species, you can't be a Plant
and an Animal at the same time -- I think you can only be one thing at
one level in Species. Place is more complex, maybe a Mountain can be a
ProtectedArea, but a Island can't be a Cave.
------
Another general complaint is that there are things sitting around at
the toplevel that have obvious categories above them: the dbpedia
ontology does a lot better than Freebase than this (Freebase doesn't
have "Work" over "Book" and "Film"); on the other hand, it's obvious
that "OlympicResult" has "SportsResult" above it, and
"SupremeCourtOfTheUnitedStatesCase" has "CourtCase" above it. It drives
me nuts that Freebase doesn't have a base class for chemical elements
and chemical compounds -- there's no type that's good for a "Moderator"
property of a nuclear reactor since a moderator could be water
(compound) or graphite (is that an element or a compound or an allotrope
of an element or a mineral?) Seems to me that Wikipedia should have a
"Substance" category which would subsume ChemicalElement, Drug, etc...
Is the Dbpedia ontology frozen in stone at this point or can we
still rationalize the toplevels a bit?
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