From http://www.w3schools.com (Copyright Refsnes Data)
WSDL is an XML-based language for describing Web services and how to access them.
WSDL stands for Web Services Description Language, and is an XML-based language for describing Web Services.
To learn more about WSDL, read our WSDL tutorial.
WSDL 1.1 was suggested in a note to W3C in March 2001 (by Ariba, IBM and Microsoft), as a language for describing Web Services.
The note also described how to use WSDL in conjunction with SOAP 1.1, HTTP GET/POST, and MIME types.
The first working drafts were published 17. December 2001.
The latest working drafts were published 11. June 2003.
WSDL 2.0 became a W3C Recommendation 26. June 2003.
To preserve the properties of the World Wide Web as technologies evolve, W3C has created a recommendation for the core design components of the Web.
Architecture of the World Wide Web, Volume One is a W3C recommendation describing the standard protocols that support the identification of, and interaction between Web resources.
| Specification | Draft / Proposal | Recommendation |
| WSDL 1.1 Note | 15. Mar 2001 | |
| WSDL Usage Scenarios | 04. Jun 2002 | |
| WSDL Requirements | 28. Oct 2002 | |
| WSDL Architecture | 11. Feb 2004 | |
| WSDL Glossary | 11. Feb 2004 | |
| WSDL Usage Scenarios | 11. Feb 2004 | |
| WSDL 1.2 Core Language | 11. Jun 2003 | |
| WSDL 1.2 Message Patterns | 11. Jun 2003 | |
| WSDL 1.2 Bindings | 11. Jun 2003 | |
| WSDL 2.0 Primer | 26. Jun 2007 | |
| WSDL 2.0 Core Language | 26. Jun 2007 | |
| WSDL 2.0 Adjuncts | 26. Jun 2007 | |
| WSDL 2.0 SOAP 1.1 Binding | 26. Jun 2007 | |
| WSDL 2.0 RDF Mapping | 26. Jun 2007 | |
| WS Addressing Core | 09. May 2006 | |
| WS Addressing SOAP Binding | 09. May 2006 | |
| Web Architecture | 15. Dec 2004 | |
From http://www.w3schools.com (Copyright Refsnes Data)