WSDL (Web Services Description Language) is an XML
vocabulary that defines the software interfaces for web services.
It organizes all of the web service technical details required for
automatic integration at the programming level, and is used to
publish IBM WebSphere collaborations as web services. WSDL is to
web services as IDL is to CORBA objects.
For more information on WSDL, go to:
http://www.w3.org/TR/wsdl