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