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RE: Port type extension proposal

From: Sandeep Kumar <sandkuma@cisco.com>
Date: Tue, 1 Oct 2002 20:03:46 -0700
To: "Martin Gudgin" <mgudgin@microsoft.com>, <www-ws-desc@w3.org>

Hi Martin,

I agree that WSDL should have a notion of portType extensions
based on the inheritance model. However, I am against the idea of
dropping the notion of ServiceType abstraction. PortTypes describe
the capability of a service (or role in some sense), where a capability
when extended, defines the sub-capability (ala subclass). However,
we need a container to describe related though disjoint capabilities
(or portTypes). Disjoint capabilities mean that a Service has two
but are mutually exclusive. We may need to describe different metadata
associated with
different capabilities. For example, I may define a define 2 capabilities of
a service:
(i) captures the behavior description in normal mode of operation
(ii) captures the behavior description in abnormal mode of operation - as in
or Disaster situation.
Clearly, the SLAs may be different in (i) (24x7) vs the (ii) (20x6). One
use HTTP binding the other may use a different binding. Remember it is the
Service from the consumer's perspective.

By throwing away the ServiceType abstraction, we are disabling modeling of
above scenarios. WSDL should definitely enable Programming Language
structure & artifacts
but much more.

BTW, I had these discussions after F2F with Steve and Joyce.

Looking forward to your (& WG members') comments.

Sandeep Kumar

-----Original Message-----
From: www-ws-desc-request@w3.org [mailto:www-ws-desc-request@w3.org]On
Behalf Of Martin Gudgin
Sent: Tuesday, October 01, 2002 5:25 PM
To: www-ws-desc@w3.org
Subject: Port type extension proposal

The port type extension proposal is at[1]. I have had some feedback from
members of the task force ( Steve, Arthur, Joyce, William ) which I have
yet to incorporate but I thought it better to get the proposal on the
table for a wider audience. I hope to incorporate the feedback received
so far later this week. Any further feedback is, of course, very

The draft is marked up with new text shown in green highlight and
deleted text shown in red strikeout.


Received on Tuesday, 1 October 2002 23:07:51 UTC

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