Re: Assigning a property in OWL DL

On Aug 9, 2006, at 2:10 PM, Daniel Gresh wrote:

> Hi,
>
> I've been wondering how to assign a property to an individual in  
> OWL DL. I can do it in OWL Full, but the OWL DL syntax won't allow  
> me to do it the way I am thinking of. This is what I am currently  
> trying:
>
>  <rdf:Description rdf:about="http://ontology.lle.rochester.edu/ 
> IRCalSystemAppendix">
>    <j.0:ImageProperty rdf:resource="http:// 
> ontology.lle.rochester.edu/Pics/Diagnostics/Calorimetry/D-AB- 
> R-035_REVA_13.png"/>
>    <rdf:type rdf:resource="http://ontology.lle.rochester.edu/ 
> InfraredFullApertureCalorimeterSystem"/>
>  </rdf:Description>
>
> I get these messages from my syntax checker:
>
> Invalid OWL DL syntax in j.0:ImageProperty-statement: j. 
> 0:IRCalSystemAppendix j.0:ImageProperty j.1:D-AB-R-035_REVA_13.png
>    Unknown Resource j.1:D-AB-R-035_REVA_13.png. In OWL DL a type  
> for every individual is mandatory (beside 'owl:DeprecatedClass' or  
> 'owl:DeprecatedProperty').
> Unknown Resource j.1:D-AB-R-035_REVA_13.png. In OWL DL a type for  
> every individual is mandatory (beside 'owl:DeprecatedClass' or  
> 'owl:DeprecatedProperty').
> This ontology is NOT well-formed.

What checker is this? Icky, man.

It looks like the problem is that you don't have a type triple for  
the png. Try adding

<owl:Thing rdf:about="http://ontology.lle.rochester.edu/Pics/ 
Diagnostics/Calorimetry/D-AB-R-035_REVA_13.png"/>

(Pellet will suggest such triples. Try the Pellet demo page.)

[snip]
> So, I am obviously missing something. I'm not really sure what to  
> do at this point. Does anyone have any ideas?

Hope this helps. It might help to avoid the rdf:resource shortcut.  
That way you always have the opportunity for  a typed node on the  
object.

Cheers,
Bijan.