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Re: OWL Lite or DL?

From: Holger Knublauch <holger@topquadrant.com>
Date: Tue, 22 Aug 2006 12:57:43 -0700
Message-ID: <44EB61B7.9080600@topquadrant.com>
CC: public-semweb-lifesci@w3.org

> On Tue, 22 Aug 2006 10:28:03 -0600, Larry Hunter wrote:
>>  In my experience, many complex knowledge modeling projects benefit
>>  from the use of metaclasses.  For example, if the domain of a
>>  relationship is limited to several specific classes, it makes sense
>>  to model those classes as members of a particular metaclass (i.e.,
>>  one that supports a particular slot type).

Larry,

this typical use case of metaclasses may not be the best solution for 
the problem.  In many cases (but you may have other reasons as well), 
people introduce metaclasses so that they can get a different behavior 
of user interfaces.  For example many ontology editors automatically 
create input fields if certain properties are in the domain of the 
instance type.

In my opinion, changing a model only to control the behavior of a user 
interface is a bad idea.  This approach was unfortunately promoted by 
some ontology editors in the past.  Ontologies are no longer just used 
as a framework to restrict the type of instances that can be entered, 
but also for various types of reasoning and information exchange on the 
Web.  For these tasks, having a complicating metaclass architecture is 
just another obstacle.

I agree with Matthias that metaclasses should be avoided whenever possible.

Holger
Received on Tuesday, 22 August 2006 19:57:53 GMT

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