What is the use of creating proxy services using WSDL.

Hi
Am a beginner in ALSB and i have a basic question. Business services are created using WSDL,thats sounds logical as we need to invoke the actual backend services .
Proxy services are connected to business services and what is the need that it can be e created using WSDL.
What is the use of creating proxy services using WSDL.

Hi,
I beleive you are confused because of the apparent inclusion of transport information in WSDL (that is the host:port/endpoint where the service is hosted). However, if you refer to the w3c specification of WSDL1.0 ([url http://www.w3.org/TR/wsdl]www.w3.org/TR/wsdl), you will find that WSDL has three separate sections:
1. The schema information that describes data element(s): specified in types
2. The message information ie message and port sections that specify the parameters and the operations
3. The service section that specify the actual protocol and endpoint binding.
Ideally, a WSDL can be broken down into these three separate components. Any WSDL containing the first two is called an abstract WSDL and is used for a top-down approcah for web services, and if the third part is used, then you get a concrete WSDL, containing invocation end-point also.
Comming back to your question one can typically use an Abstract WSDL for creating proxy service. This way, the service requester and integration can go on two separate threads where the common denominator or agreement between these two parties in terms of operation name and data element are imposed using the WSDL.
Thanks and Regards
Vivek Nandey
BEA Certified Developer for Integration Solutions

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