Describing Web Services with WSDL
We can think of WSDL as an XML-based means for expressing the interface to a given Web service. Describing a service using WSDL boils down to abstractly defining service functionality and then binding it to a physical protocol.
The W3C report on WSDL, online at http://www.w3c.org/TR/wsdl.html, is even more general than this, stating that a Web service is the process of specifying a set of network endpoints operating on messages that contain either document- or procedure-oriented information. That's a mouthful, and before it can make any sense, we need to discuss endpoints and illuminate the distinction between logical and physical representations of a service.
First, as the text obviously implies, we need to ...
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