W3C home > Mailing lists > Public > www-ws-desc@w3.org > April 2003

Re: proposal for restricting a service to a single interface

From: Arthur Ryman <ryman@ca.ibm.com>
Date: Wed, 30 Apr 2003 12:56:41 -0400
To: "Amelia A. Lewis" <alewis@tibco.com>
Cc: www-ws-desc@w3.org, www-ws-desc-request@w3.org
Message-ID: <OF1FD94A14.E9EC1306-ON85256D18.005A101A@torolab.ibm.com>

My reading of "alternative ways to invoke the service" is that there is 
one state machine as you call it. I interpret semantic equivalence to mean 
that the operations have the same effect on the state of the service. 
Please forgive the following somewhat facetious example. In the following 
I assume that the telephone number URI problem has been solved.

I can order pizza from Pizza, Pizza  in Toronto either by phone, or online 
[1]. Therefore I have one PizzaInterface, two bindings, but one <service>. 
I could place my order on the Web and then later phone in a correction. 
I'd still get just one pizza delivered.

Putting 17 vendors into the same <service> violates that. For example, 
there may be 17 pizza companies that all decide to implement the 
PizzaInterface. They shouldn't be placed in some pizza portal <service> 
element. If I order a pizza from Pizza Pizza, I don't have to pay Momma's 

You may regard the proposed restriction as silly and of no value, but I 
hope you'll grant that it is at least simple and clear.


Arthur Ryman
Received on Wednesday, 30 April 2003 12:56:47 UTC

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