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RE: potential users of web services

From: Timothy N. Jones <tim@crossweave.com>
Date: Thu, 4 Apr 2002 11:49:36 -0800 (PST)
Message-ID: <14620722.1017949776828.JavaMail.tomcat@linux>
To: Anne Thomas Manes <anne@manes.net>
Cc: thomi@di.uoa.gr, www-ws@w3.org, www-ws-arch@w3.org

I would have to object to the separation of UI and web service described
below on the grounds that it appears incompatible with the notion of
interactive web services.  For example, it seems reasonable that at some
point along a web service call chain a service could dynamically determine
that it needs additional information from the user to complete its task.
Unless UIs are able to themselves be web services I think the WS
architecture will not be able to support user-driven applications, which
would be an unfortunate limitation.

Regards,
Tim Jones
CrossWeave, Inc.

> Thomi,
> Ask five people the definition of "web service" and you'll get six
answers.
> I generally describe a web service as a service that communicates over the
> web. A service is a component that exposes a programmatic interface. The
> service interface must be described; and the service implementation must
be
> discoverable.
> When you relate this abstract definition to current technologies, you can
> implement a web service by creating a service that exposes a SOAP
interface,
> which is described by WSDL, and which is registered in UDDI. But I
wouldn't
> want to use current technologies to *define* the basic concept. I also
don't
> think that it's essential to use any of these technologies to create a web
> service. I can certainly create a web service using XML-RPC or RosettaNet
or
> a host of other technologies.
> That said, I would concur that web services are intended to be consumed by
> applications rather than humans. But keep in mind that a user interface is
> an application. If I wanted to arrange food for 500 people for two weeks
in
> Dubai, I would use a catering application, which in turn uses web services
> to find caterers that can provide services in Dubai. The UI isn't the web
> service. The UI uses web services to accomplish its work. Hence an ASP
page
> or HTML form aren't web services, they are an interface to web services.
> Best regards,
> Anne Thomas Manes
> CTO, Systinet
> > -----Original Message-----
> > From: www-ws-request@w3.org [mailto:www-ws-request@w3.org]On
> > Behalf Of Thomi Pilioura
> > Sent: Thursday, April 04, 2002 9:09 AM
> > To: www-ws@w3.org
> > Subject: potential users of web services
> >
> >
> > Hi all,
> >
> > I'm little confused about the notion of the term "web services".
> > When I'm reading papers related to UDDI,WSDL,SOAP they present
> > web services
> > as a new age of distributed computing and as such they are only useful
to
> > developers (who are trying to build web applicattions) and not to the
> > end-users. But when I'm reading papers related to DAML-S the idea I'm
> > getting for web services is different. They are also useful to
> > end users as
> > it shown by DAML-S motivating scenarios:
> >
> > Web service discovery
> > Find me a shipping service that transports goods to Dubai.
> >
> > Web service invocation
> > Buy me 500 lbs. powdered milk from www.acmemoo.com
> >
> > Web service selection, composition and interoperation
> > Arrange food for 500 people for 2 weeks in Dubai.
> >
> > Web service execution monitoring
> > Has the powdered milk been ordered and paid for yet?
> >
> > There are also numerous papers that use the term service (and not "web
> > service") and are talking about UDDI, WSDL and DAML-S. What's the
> > difference
> > between "web service" and "service" if both of them work over
> > Internet? For
> > example, a search engine (such as google) is a service, but when it is
> > described in WSDL, published in UDDI and can be invoked using
> > SOAP becomes a
> > web service? Ia a asp or an HTML form a service or a web service?
> >
> > In summary which are the potential users of web services (web service
> > providers, developers, end-users)?
> >
> > could you please shed some light on this?
> > regards
> > Thomi Pilioura
> >
> >
> >
> >
Received on Thursday, 4 April 2002 14:51:03 GMT

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