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WSDL
What is WSDL?
WSDL is an XML format for describing network services as a set of endpoints operating on messages containing either document-oriented or procedure-oriented information. The operations and messages are described abstractly, and then bound to a concrete network protocol and message format to define an endpoint. Related concrete endpoints are combined into abstract endpoints (services). WSDL is extensible to allow description of endpoints and their messages regardless of what message formats or network protocols are used to communicate, however, the only bindings described in this document describe how to use WSDL in conjunction with SOAP 1.1, HTTP GET/POST, and MIME.
WSDL supersedes IBM's NASSL and Microsoft's SCL efforts, and it's complementary to the UDDI initiative.
WSDL Tutorials, and Articles
XML Cover Pages on WSDL
Supercharging WSDL with RDF(managing structured Web service metadata)
Using WSDL in SOAP applications
WSDL processing with XSLT
Annotated WSDL Examples
Creating WSDL and a Proxy Client from a Web Service
WSDL Software
IBM's Web Services/WSDL Toolkit
WSDL Toolkit List
WSDL Specifications & References
Web Services Description Language (WSDL) 1.1
WSDL 1.1 Reference
Java APIs for WSDL
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