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DAML-ONT: the case for closedness

From: Je'ro^me Euzenat <Jerome.Euzenat@inrialpes.fr>
Date: Mon, 16 Oct 2000 11:01:36 +0200
Message-Id: <p04310102b60f3b8f7b18@[]>
To: www-rdf-logic <www-rdf-logic@w3.org>
Hi list,

	as mentionned by James Hendler, the language has been given 
an open character which follows the open character of the web. That 
is: anyone can add new information about a class. This complies with 
the DL vision taken in OIL.
	However, it could be nice to allow users to close the meaning 
of a name so that no one can add to it. This would be useful, for 
ontology designers to state what a name exactly means and to allow 
refinements (through subclassing) but no modification (through 
	This would also allow for:

			equivalentTo( X, closed( Y ))

stating that X is defined to have the exact meaning of Y at the 
moment of interpretation (to be defined, ok), but not to endorse the 
unknown statements that can be made elsewhere about X.
	This would help to guarantee the result of subsumption 
computation which are only valid as far as no more is asserted of the 

	More problems than solutions I am affraid, this could require 
to close not only one term but a complete "microtheory"... but, in 
such an open world, being able to close definitions seems to me very 
important (even if overuse will limit the reusing of ontologies).
  Jérôme Euzenat                  __
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Received on Monday, 16 October 2000 04:59:20 UTC

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