RE: NEW Issue - Reference to WSDL definition in an EPR

In case this issue looks familiar to the twenty or so people who attended the NYC face-to-face, it should. This "new" issue is a restatement of an issue that was defined at the second day of that face-to-face meeting in New York; it was discussed for two hours on the third day of that meeting and discussion was continued to the teleconference.  However, when the teleconference occured, the issue had been framed as the optionality of metadata - certainly a point of view on a link to a WSDL service definition, but not the actual topic of the issue defined at the face-to-face.  However, at the teleconference I was given the action item to redefine both this issue and the multiple ports issue.  I did that, publishing both issues the following morning.  The ports issue made it to the issue list, but the WSDL reference issue disappeared.  Instead an issue dealing with WSDL:location that was submitted later by another individual appeared.
 
This reference to WSDL definition in an EPR is a restatement of the issue in the formal manner that was defined after the sequence of events described above.  Please discuss this issue based on the formal definition I have presented.
 
With respect,
Rebecca Bergersen
Principal Architect, Middleware Standards
 <mailto:rebecca.bergersen@iona.com> rebecca.bergersen@iona.com
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-----Original Message-----
From: Bergersen, Rebecca 
Sent: Wednesday, November 10, 2004 7:11 PM
To: 'public-ws-addressing@w3.org'
Cc: Vinoski, Stephen; Newcomer, Eric; Bergersen, Rebecca
Subject: NEW Issue - Reference to WSDL definition in an EPR


Title: Reference to WSDL definition in an EPR
 
Description:  According to the ws-addressing submission, "Endpoint references
  convey the information needed to identify/reference a Web service
  endpoint, and may be used in several different ways: endpoint
  references are suitable for conveying the information needed to
  access a Web service endpoint...."  However, in order to assure that
  the information needed to access a Web service endpoint, a reference
  to the WSDL definition of a service is sometimes required and in
  those cases must be included as part of the EPR construct. 
 
Justification: This requirement derives from several common use
  cases. For example, in a communication chain there may be
  intermediaries that can accept incoming messages and, in a fully
  dynamic manner, further dispatch or route those onward. This is what
  we do with our products.  The trick is that the next recipient might
  use a completely different protocol/transport/format than what the
  message came in on. For this case it is necessary to perform a fully
  dynamic dispatch by using the target's WSDL definition and to build
  dynamic proxies and to bind to the service over one of the
  protocol/transport/format combinations it supports. The whole
  definition is required so there is access to all the possible bindings
  for the service. The WSDL definition is also used in cases where
  consumer applications want to avoid compiling in static port type
  information, and instead want, for flexibility purposes, late
  (runtime) binding to the service.   
 
Target: Core
 
Proposal:
  1. Extend section 2.1, Information Model for Endpoint References, to
  include the following:
    [definition] : URI (0..1)
      The optional element that provides an link to the WSDL service
      definition. 
 
  2. Extend section 2.2, Endpoint Reference XML Infoset
     Representation, to include the following:
 
     Example 2-1. @@@
       <wsa:EndpointReference>
          ...
          <wsdl:serviceDefinition>xs:anyURI</wsdl:serviceDefinition>
          ...
       </wsa:EndpointReference>
      
      and to include the following as a description of the additional
      information: 
 
      /wsdl:serviceDefinition
      This optional element provides a link to the WSDL service
      definition.