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Does WSDL file physically required on the client's machine?

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Hello All,
I have one basic question regarding the Web Services fundamentals.
If I am accessing one web-Service exposed by some server. Then do I need to have a physical WSDL file on my machine?
If yes then why? If not then please tell me who will validate the method names & parameters in my SOAP message? Does this validation will happen after a round trip on http to the server?
If anybody has the explnatory answer then please tell it to me. I am refering many books and sites for the web-services information, but no where I found this information clearely.
Thanks in advance
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OK, nearly every SOAP system in existence (Apache SOAP, Apache Axis, JAX-RPC, even M$) works by generating Proxy classes for a particular Web Service from the WSDL that describes the service. Once the proxy classes are generated, the WSDL document is not needed. Some systems (like JAX-RPC) allow runtime access to the WSDL document for use in selecting the right proxy but it's not required.
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