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Re: The use of the parameterValue property

From: Evren Sirin <evren@cs.umd.edu>
Date: Wed, 12 Jan 2005 13:14:18 -0500
Message-ID: <41E568FA.1090308@cs.umd.edu>
To: Daniel Elenius <daele@ida.liu.se>
CC: Tatiana Vieira <tascvieira@yahoo.com.br>, public-sws-ig@w3.org

Daniel Elenius wrote:

>
> I brought this up a while ago on this list, and no-one objected to 
> deprecating this property, since we have valueData to do the job. 
> parameterValue is a leftover from earlier incarnations of OWL-S.

I probably missed that message because I would object deprecating 
parameterValue. It is possible to use valueData instead of 
parameterValue but it is not always straight-forward because valueData 
can only be used with Perform construct whereas parameterValue can 
directly be attached to a process definition. The use case is this (and 
I'm not making up this case we actually have running examples similar to 
this one):

Suppose there is a WSDL service with two inputs A and B and I want to 
define an AtomicProcess grounded in this service. But suppose that for 
my application the input B will always be some constant value. It is 
very easy to do this using parameterValue, define AtomicProcess P, two 
inputs X and Y (mapped to A and B respectively) and attach a 
parameterValue to Y to specify the constant value. If we want to do this 
using valueData then I have to define AtomicProcess P1 (similar to P 
above but no parameterValue), then define CompositeProcess P2 that is a 
sequence of only one Perform (performing P1) and its input binding will 
specify the constant value. As you can see the second way is harder to 
do and it is nice to have a compact version of this functionality.

Regards,
Evren


>
> /Daniel
>
> Tatiana Vieira wrote:
>
>> Hi people,
>>  
>> Could anyone explain me the use of the parameterValue property? As I 
>> understood, the parameterType declares the type of the data the 
>> service will produce as output. But how can we use parameterValue? I 
>> didn't see any example and as OWL-S doesn't define any model for the 
>> result of a process, how/when can we use this property?
>>  
>> Thank you in advance,
>>  
>> Tatiana.
>>
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>
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Received on Wednesday, 12 January 2005 18:15:14 GMT

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