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[protege-owl] defclass troubles with Jess engine

Samson Tu swt at
Wed Oct 29 14:12:38 PDT 2008

The problem is that, since Protege build 500, the names of OWL classes 
are URIs "http://www...."

You have to write

(defclass TestPerson (is-a

instead of (defclass TestPerson (is-a owl:Thing))


Joseph Awalebo wrote:
> Hello,
> I am walking th JessTab Tutorial.
> The tab is display well and I can create rules, facts. But when I put this 
> instruction: (defclass TestPerson (is-a owl:Thing)) to create the class 
> TestPerson, I get the following error:
> -----------------------------------------------------------------------
> Jess reported an error in routine defclass
> 	while executing (defclass TestPerson (is-a owl:Thing)).
>   Message: Protege class not found: owl:Thing.
>   Program text: ( defclass TestPerson ( is-a owl:Thing ) )  at line 4.
> -----------------------------------------------------------------------
> Can somebody helps me fix this problem.
> Cheers
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