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Re: Error with Annotation Properties

From: Bijan Parsia <bparsia@isr.umd.edu>
Date: Mon, 11 Apr 2005 23:41:08 -0400
Message-Id: <dd116952f4d90547ac30e5c9205501cb@isr.umd.edu>
Cc: public-owl-dev@w3.org, evren Sirin <evren@cs.umd.edu>
To: Webster <semantic.dog@gmail.com>

On Apr 11, 2005, at 6:02 PM, Webster wrote:

> Hello!
>
> I have run into an issue with annotation properties and their support
> by two popular validators.
>
> Pellet [1] indicates that the following is OWL-Lite/DL, yet WonderWeb
> [2] throws a warning due to an "Untyped Individual" and forces
> OWL-Full.

There are actually two problems (or possible problems) with your 
example.

> <rdf:RDF
>   xmlns:owl="http://www.w3.org/2002/07/owl#"
>   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>   xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
>
> <owl:Class rdf:about="http://test/class">
>   <rdfs:label>A class</rdfs:label>
      ^^^^^^^^^^^^^^
Remove this to pass the WonderWeb validator.

I have to go back to the specs to check whether you can have annotation 
properties on descriptions like this. It's probably a good idea to 
avoid them.

>   <rdfs:subClassOf>
>     <owl:Restriction>
>       <rdfs:label>A restriction</rdfs:label>
>       <owl:onProperty rdf:resource="http://test" />
>       <owl:minCardinality>1</owl:minCardinality>
[snip]

This should have 
rdf:datatype="http://www.w3.org/2001/XMLSchema#nonNegativeInteger". 
Neither system detects that! So I should check the specs there, too :)

When I figure out what the right behavior is, we'll update the Pellet 
side (and submit a patch to the OWL API).

Cheers,
Bijan Parsia.
Received on Tuesday, 12 April 2005 03:41:11 GMT

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