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Subject: Re: [uddi-spec] WSDL TN: Issue 1 - mapping between wsdl:service anduddi:businessService
Claus, Comments below in the usual style. John ----- Original Message ----- From: "Von Riegen, Claus" <claus.von.riegen@sap.com> To: "'John Colgrave'" <colgrave@hursley.ibm.com>; "uddi-spec" <uddi-spec@lists.oasis-open.org> Sent: Wednesday, November 20, 2002 2:29 PM Subject: RE: [uddi-spec] WSDL TN: Issue 1 - mapping between wsdl:service and uddi:businessService > John, > > Please find <CvR>my comments</CvR> below. > > Claus > > -----Original Message----- > From: John Colgrave [mailto:colgrave@hursley.ibm.com] > Sent: Mittwoch, 20. November 2002 11:54 > To: uddi-spec > Subject: [uddi-spec] WSDL TN: Issue 1 - mapping between wsdl:service and > uddi:businessService > > > I do not agree there is a fundamental difference between the grouping > offered by a uddi:businessService and a wsdl:service. The UDDI > specification describes a businessService as describing "a collection of > related Web services offered by an organization described by a > businessEntity." and section 1.6.2 describes a fairly loose logical grouping > of Web services. I think it is perfectly valid to have bindingTemplates > within a single businessService that correspond to ports that in turn > correspond to different portTypes, with the assumption that there is some > relationship among them. > > <CvR>Right you are! There are cases where the proposed mapping approach is perfectly valid. But it is at least questionable to mandate the approach for ALL wsdl:services in order to conform to the WSDL TN when they are registered with UDDI.</CvR> <JC> I think we can consider it questioned. :-) I think that people will "do the right thing" as far as defining services is concerned because of the programming language issues etc. so I don't see the need for a more complicated scheme allowing people to assign individual ports to different businessServices. </JC> > Given that WS-I says very little regarding wsdl:services I am not inclined > to attempt to invent any UDDI-specific Best Practice in this area. I quite > agree that a WSDL Best Practice independent of UDDI would be a good thing. > > The other dimension to consider is the programming language/tool one. This > is a case where it is particularly relevant. I can only speak with any > confidence about Java and in Java there is a specification, JAX-RPC, that > includes a mapping from WSDL to Java. The mapping of a WSDL service is to a > service class which acts as a factory for the things corresponding to the > ports etc. so the collection of the ports is exposed to the Java programming > model. You cannot arbitrarily rearrange the aggregation of ports without > changing the programming model for that service. > > <CvR>I am not a Java expert at all, but why should Web service consumers rely on the Web service provider's Java programming model?</CvR> <JC> They wouldn't but the Java programming model can apply to the client side as well as the server side. If I have some deployment WSDL then this factory class that is used to acquire a port etc. is used on the client side not the service side. </JC> > Two final factors are that not keeping the 1-1 correspondence will make it > harder to discover related (in the WSDL sense!) ports > > <CvR>If related ports (in terms of the containing service) are to be discoverable in UDDI, the corresponding UDDI registrations should be tagged with appropriate metadata, for example, by using the proposed approach. But if related ports are to registered in different businessServices, businessEntities or different UDDI registries, the approach can't be used.</CvR> <JC> Yes, but that is a circular argument. I do not see the need to allow ports from the same wsdl:service to be mapped to bindingTemplates in different uddi:businessServices. </JC> > and to generate deployment WSDL. > > <CvR>I can still generate a deployment WSDL by using the bindingTemplate's accessPoint and the referenced binding tModel.</CvR> <JC> The deployment WSDL is for the wsdl:service as a whole, not an individual port. </JC> > Given all of this, I propose leaving the mapping largely the way it is now, > mapping a wsdl:service to exactly one businessService. I am in favour of > adding the extra restriction that only a single wsdl:service can be mapped > to a uddi:businessService. > > John > > > ---------------------------------------------------------------- > To subscribe or unsubscribe from this elist use the subscription > manager: <http://lists.oasis-open.org/ob/adm.pl>
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