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the World Wide Web Consortium, however it is now working on a new version 2.0, that will be a reccomendation (an official standard), and thus endorsed by the W3C.
It is commonly abbreviated as WSDL in technical literature and often pronounced "Whuz-Duhl".
WSDL describes the public interface to the web service. This is an XML-based service description on how to communicate using the web service; namely the protocol bindings and message formats required to interact with the web services listed in its directory. The supported operations and messages are described abstractly, and then bound to a concrete network protocol and message format.