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RE: parameter order

From: Bob Cunnings <cunnings@lectrosonics.com>
Date: Tue, 28 Oct 2003 16:16:24 -0700
To: <www-ws-desc@w3.org>
Message-ID: <000e01c39da9$814b1080$880410ac@bobc2>



Hello,

FWIW, a voice from the crowd in the bleachers:

It was not so long ago the issue of indicating return values in WSDL 1.1
descriptions of SOAP RPC operations proved a big headache for those
working on WSDL1.1/SOAP1.1 interop (viz. soapbuilders). The
parameterOrder attribute in WSDL 1.1 could be exploited to do so
indirectly, but had the weakness that it was an optional attribute.
There were also problems on the SOAP side w.r.t. distinguishing return
value accessors from other [out] parameters. At the time it was
fervently hoped that succeeding versions of both specs would provide
improvements in these areas, and of course SOAP 1.2 took care of this
with rpc:result.

The issue at that time was not one of distinguishing between, [in] and
[out] parameters, but one of distinguishing between return values and
other [out] parameters.

So if the rpc style is to be supported by WSDL 2.0, then historical
experience, if nothing else, may suggest that it would be a good idea to
define a simple mechanism to specify the return value component of an
RPC signature, to improve interop. This one bit of information can help
WSDL aware RPC deserializers immensely.

RC
Received on Tuesday, 28 October 2003 18:16:47 GMT

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