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Re: Bottom up approach to web services

From: <charlie@semantech.org>
Date: Tue, 9 Sep 2003 13:12:01 +0800
Message-ID: <1063084321.3f5d6121dd4e2@>
To: Evren Sirin <evren@cs.umd.edu>
Cc: "www-ws@w3.org" <www-ws@w3.org>

I have checked that out, thanks. To what extent can one automate such 
composition process? Also it seems to me that not being able to make use of the 
control constructs in the final composition is restrictive and does not take 
advantage of the expressive potential of the process model. 


Quoting Evren Sirin <evren@cs.umd.edu>:

> >
> >
> > Hi all,
> > The present DAML-S examples, congo and bravoair, are both built in a
> top-down
> > manner. Is it possible to build similar services in a bottom-up approach?
> I
> > envision quite some difficulty if one wants to create a composite service
> by
> > making use of the specified control constructs of the process model.
> >
> > Has anyone tried to do this?
> Actually, yes. We have built a DAML-S composer that guides the user to
> create composite processes in a bottom-up approach. User starts with a
> single service, presented with possible services that can be matched with
> it, filters the results according to non-functional attributes of the
> services. The resulting composite service can be executed using the WSDL
> groundings. However, GUI is data-flow oriented rather than control flow
> oriented so, as you suggest, you cannot make use of control constructs such
> as loops and conditionals.
> Check out http://www.mindswap.org/~evren/composer where you can find links
> to some sample service descriptions, a paper that describes the system and
> an online demo of the system.
> Best,
> Evren
> > -------------------------------------------------
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> >
> >

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Received on Tuesday, 9 September 2003 01:23:03 UTC

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