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Re: the precondition property in OWL-S 1.0

From: Marta Sabou <marta@cs.vu.nl>
Date: Fri, 07 Nov 2003 09:43:09 +0100
Message-ID: <3FAB5B1D.2E83FB2F@cs.vu.nl>
Cc: www-ws@w3.org



 Monika, Drew,

 I completely agree with the proposed solution. This should definitely be
implemented in the next release.

 Cheers,

Marta


  
Drew McDermott wrote:
> 
>    [Monika Solanki, in re DAML-S spec]
>    Currently in the 1.0 version of the process model, we have the following
> 
>      <owl:Class rdf:ID="Precondition" />
>    - <owl:ObjectProperty rdf:ID="preCondition">
>      <rdfs:domain rdf:resource="#Precondition" />
>      <rdfs:range rdf:resource="#Condition" />
>      </owl:ObjectProperty>
> 
>    Where, Condition is defined as,
> 
>    - <owl:Class rdf:ID="Condition">
>      <rdfs:comment>This is a "place-holder" for now, which awaits further
>    work from the DAML/OWL community. An instance of Condition is a logical
>    formula that evaluates to true or false. Eventually we expect this to be
>    defined elsewhere, as part of a OWL extension allowing for logical
>    expressions.</rdfs:comment>
>      </owl:Class>
> 
>    Somehow I am not able to grasp the utility of the property
>    "preCondition".  Since in this model, we have IOPEs as Classes,
>    therefore I believe all we need to do is make Precondition a subclass of
>    Condition.
> 
>     <owl:Class rdf:ID="PreCondition">
>      <rdfs:subClassOf rdf:resource="#Condition" />
>      </owl:Class>
> 
>    The property preCondition, introduces redundancy as it is ranging over
>    the class "Condition" anyways.
> 
>    Feedback appreciated in case I missed something.
> 
> You're right, as far as I can see.  The important property is
> hasPrecondition, which connects a Condition to a
> Process or Process step.  There is no reason for the class
> Precondition to exist, let alone a property preCondition linking a
> Precondition to a Condition (itself?).
> 
> --
>                                              -- Drew McDermott
>                                                 Yale University CS Dept.

-- 
 Marta Sabou
Received on Friday, 7 November 2003 03:43:15 GMT

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