Appendix H. WSDL

The need for the Web services Description Language (WSDL) specification arose from the need to standardize the Web service technology stack.

Microsoft’s service description languages Service Description Language (SDL) and Service Control Language (SCL) and IBM’s NASSL have been unified to form anew language called WSDL. WSDL is an eXtended Markup Language (XML) format for defining Web services and describing how to interact with them. In other words, WSDL defines the interface and the mechanics of service interaction.

As explained by W3C — “WSDL is an XML document for describing Web services as a set of endpoints operating on messages containing either document-oriented or procedure-oriented information.”

A WSDL document is used ...

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