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Re: earl:Outcome (was Re: ACTION-30: Updated EARL 1.0 Schema)

From: Johannes Koch <johannes.koch@fit.fraunhofer.de>
Date: Mon, 17 Nov 2008 15:49:43 +0100
Message-ID: <49218487.2080003@fit.fraunhofer.de>
To: ERT WG <public-wai-ert@w3.org>

Hi Shadi

Shadi Abou-Zahra schrieb:

> Johannes Koch wrote:
>>
>> Shadi Abou-Zahra schrieb:
>>
>>> It is indeed clearer and is simpler for sub-classing. For example, 
>>> you can create a my:probablyPass class from earl:cannotTell pretty 
>>> easily because it is defined as a class. This is an essential 
>>> functionality.
>>
>> The earl:Outcome http://www.w3.org/ns/earl#cannotTell is not a class, 
>> it's a resource.
> 
> Do you mean the resource of type class can not be sub-classed  (ie to say
> "my:probablyPass - rdfs:subclassOf - earl:cannotTell")?

In RDF, every class is a resource. But not every resource is a class.

earl:Outcome is a class (its rdf:type is rdfs:Class) and so can be 
sub-classed (e.g. my:CannotTellOutcome rdfs:subClassOf earl:Outcome). 
earl:cannotTell is a resource, an instance of earl:Outcome, but not a 
class itself, and so cannot be sub-classed.

Someone who wants to extend the outcome vocabulary part, might do the 
following:

<rdf:RDF ...
   xmlns:my="http://www.example.org/my#">

<!-- define new class CannotTellOutcome as a sub-class of earl:Outcome -->
<rdfs:Class rdf:ID="CannotTellOutcome">
   <rdfs:subClassOf rdf:resource="http://www.w3.org/ns/earl#Outcome"/>
</rdfs:Class>

<!-- make http://www.w3.org/ns/earl#cannotTell of type 
my:CannotTellOutcome -->
<rdf:Description rdf:about="http://www.w3.org/ns/earl#cannotTell">
   <rdf:type rdf:resource="http://www.example.org/my#CannotTellOutcome"/>
</rdf:Description>

<!-- define a new value probablyPass which is of type 
my:CannotTellOutcome -->
<my:CannotTellOutcome rdf:ID="probablyPass">
   ...
</my:CannotTellOutcome>

</rdf:RDF>

-- 
Johannes Koch
Fraunhofer Institute for Applied Information Technology FIT
Web Compliance Center
Schloss Birlinghoven, D-53757 Sankt Augustin, Germany
Phone: +49-2241-142628    Fax: +49-2241-142065
Received on Monday, 17 November 2008 15:03:31 GMT

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