Cast Iron CDK WSDL file
A WSDL file is an XML-format file that defines network services as a set of endpoints. WSDL files describe how to access a web service and specify what operations that service performs. WSDL's are usually developed by a web service provider and may be made available through a UDDI (Universal Description, Discovery and Integration) registry.
At the outset of your project, you must import a WS-I (Web Service Interoperability)-compliant WSDL file into your development platform so your development environment can generate the objects needed to build client web service applications. Web service API's provide a set of objects or WSDL-type definitions and a set Web service operations.