W3C home > Mailing lists > Public > www-ws-desc@w3.org > November 2006

Generic proposal for enganging MTOM in WSDL 2.0

From: <paul.downey@bt.com>
Date: Tue, 14 Nov 2006 09:39:49 -0000
Message-ID: <2A7793353757DB4392DF4DFBBC95225504BFF039@I2KM11-UKBR.domain1.systemhost.net>
To: <www-ws-desc@w3.org>

One of the issues resulting from the removal of Features and Properties
from WSDL 2.0 is the loss of the ability to make simple assertions to
indicate a feature is engaged.  

Applying such assertions as first class WSDL extension elements,
whilst possible, is unlikely to achieve interoperability in a world
dominated by WS-Policy. 

But supporting the whole of WS-Policy is seen as too high a bar 
for simple processors whose only use-case is applying simple assertions
such as engaging MTOM or Addressing. 


WSDL 2.0 provides an extension attribute which MAY be used to indicate
a WS-Policy attachment is "vanilla", only contains a single set of 
assertions and does not contain any compositors, e.g.:

  <Policy wsdli:simpleAssertions="true">
    <wsoma:OptimizedMimeSerialization /> 
    <wsa:UsingAddressing />

A non-Policy aware processor may process the wrapped assertions
as just another hop in their XPaths, and yet continue to interoperate
with processors which support the whole of WS-Policy.

In the case of MTOM, there still needs to be a set of extension elements
defined, but there is work in this area, all be it currently 
outside of a recognised standards body [1].


[1] http://www-128.ibm.com/developerworks/webservices/library/specification/ws-mtom/
Received on Tuesday, 14 November 2006 09:41:14 UTC

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