SEM: common class concept

Something that is an owl:Class is apparently *not*
an owl:Thing in OWL DL, whereas it *is* in OWL Full:

  ex:x rdf:type owl:Class.
=>
  ex:x rdf:type owl:Thing.

I'm not seeing it anymore when trying to interoperate
with DL unless there's a clear common class concept
(rtf:type).

--
Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/