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RE: What does WSDL describe?

From: Savas Parastatidis <Savas.Parastatidis@newcastle.ac.uk>
Date: Mon, 27 Oct 2003 02:53:44 -0000
Message-ID: <BC28A9E979C56C44BCBC2DED313A4470021C3939@bond.ncl.ac.uk>
To: "Mark Baker" <distobj@acm.org>
Cc: <www-ws-desc@w3.org>

Mark,

> 
> You claim there's no operation, but there really is one, because there
> remains a notion of "success" and "failure".  You just have to ask
> "success and failure of what?".  The answer to that question is your
> operation, whether or not you choose to include it in your message.
> 

There doesn't necessarily have to be an answer. I can imagine situations
where there isn't a requirement for a response.
 
> So it's true that you can get a whole lot done with just the "process
> this state" implicit operation in your example - heck, EDI was built
> around that operation (AFAICT).  But at least one more would be nice;
> an operation for *retrieving* the state of things.
> 

I don't use the terms "process" or "state". Sending a message is not an
instruction to an agent to do something. It's just a message. No other
semantics attached. Do you want to call that message "state"? That's up
to you.

> 
> > All these within the concepts of WSA where
> > you have the additional protocols for adding extra functionality,
the
> > communication protocol independence, modularity, etc.
> 
> Sorry, I don't understand what you mean there.
> 

Apologies. That was not very clear. What I meant was that the WSA
document describes an architecture for building distributed applications
that may use a set of protocols for message correlation, transactions,
coordination, security, orchestration, etc. All that in a
transport-neutral way (no dependence on HTTP for example). Web Services
are these agents that can receive/send messages that carry information
necessary for those protocols. All that (and more) are part of the Web
Services Architecture. So, I am talking about message exchange within
this model and not the model described by REST.

Regards,
.savas.
Received on Sunday, 26 October 2003 21:53:47 GMT

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