We read the WSDL on the server. The WSDL defines the external binding of the service (the service API). However, the service may be Java or any other technology and we read the WSDL along with mapping information in the server and bind the wsdl API to the service implementation (whatever it may be). In fact, we do very little different on the server and client with regards WSDL processing.

In our processing pipeline the SOAP being processed is verified against the WSDL description and then passed to an adapter that does necessary conversions to the target service implementation (such as binding to Java). The fact that Java is the implementaton of a service is not relevant in the processing of the SOAP message and identifying its target operation. The WSDL is used for this.


Rogers, Tony wrote:
The original question related to the server, not the client.
Yes, the server COULD read the WSDL, but usually it doesn't - the WSDL is often written to describe the server after the server has been created, or the WSDL is created at the same time as the service.
More often, the client reads the WSDL (as you suggest in the context of client proxies) to know what the interface is like.
It is easily argued that the WSDL exists to describe the server for the benefit of the client. However, a server could also use the WSDL - no argument.
Perhaps the most convincing argument for a server reading the WSDL is when a client is implementing a call-back web service.
Tony Rogers
-----Original Message-----
From: www-ws-desc-request@w3.org on behalf of Arthur Ryman
Sent: Sun 07-Aug-05 4:59
To: Jonathan Marsh
Cc: tlais; www-ws-desc@w3.org; www-ws-desc-request@w3.org
Subject: RE: question-WSDL


FYI, there are test tools that interpret WSDL dynamically. Also, some scripting technologies read WSDL are runtime to create a client proxy.

Arthur Ryman,
Rational Desktop Tools Development

phone: +1-905-413-3077, TL 969-3077
assistant: +1-905-413-2411, TL 969-2411
fax: +1-905-413-4920, TL 969-4920
mobile: +1-416-939-5063, text: 4169395063@fido.ca
intranet: http://labweb.torolab.ibm.com/DRY6/

"Jonathan Marsh" <jmarsh@microsoft.com>
Sent by: www-ws-desc-request@w3.org

08/05/2005 05:58 PM

"tlais" <mazentlais@yahoo.fr>, <www-ws-desc@w3.org>

RE: question-WSDL

The WSDL document describes the travel reservation service, from its
point of view (that is, an 'in-out' MEP is 'in' to the service, followed
by 'out' from the service).

A service developer may obtain or create a WSDL and then use it to
generate a stub of the service, but it is also common that the service
is developed first, and then WSDL generated describing that service.
There is no tight run-time linkage between WSDL and the service.  The
WSDL could even be provided by a third party, without the knowledge of
the service.

Probably the most important use of WSDL though will be for generating
code for clients that wish to connect to the service.

Hope this helps.
- Jonathan

> -----Original Message-----
> From: www-ws-desc-request@w3.org [mailto:www-ws-desc-request@w3.org]
> On Behalf Of tlais
> Sent: Friday, August 05, 2005 1:58 AM
> To: www-ws-desc@w3.org
> Subject: question-WSDL
> Hello all,
> I'm a new member in the mailing list. I've read many documents on the
> and WSDL spec, but I didn't find a response to my question.
> Supposing a server provides a "TRAVEL RESERVATION" web service. Does
> the
> server use the WSDL document of the "TRAVEL RESERVATION" service to
> send
> and receive SOAP messages? I mean does the server interpret the WSDL
> document of the service provided by the server itself?
> Regards