I know that wikipedia isn't absolute truth, but I would imagine theWell, as it says on the page you cite, the WS-I requires a WSDL. IBM, Microsoft, BEA, SAP, Oracle, Sun and Intel all require a WSDL, as does OASIS. So yechnically you don't need a WSDL - unless you plan to conform to industry standards.
definition of web services has been critiqued by thousands of individuals
more involved in web services than you or I. Maybe you are thinking of the
WS-I basic profile?
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