WSDL stands for Web Services Description Language and is an XML-based language that is defined by the W3C for describing an interface between applications.
A WSDL definition tells a client how to compose a Web services request and describes the interface that is provided by the server.
Both binding and portType/interface define operations.
Each operation comprises input and output elements defined in terms of messages or message parts.
The optional parameterOrder attribute is only applicable for rpc-style WSDL. The value of the parameterOrder attribute is an ordered list of WSDL message parts providing a hint to a Web service provider about how the parts map to a method signature.
The message elements define a logical message in terms of one or more parts. (Each part might correspond to a parameter on a method call.)
A part is defined either as an XML Schema element or as an XML Schema type.
See the W3C at: http://www.w3.org and in particular the WSDL 1.1 document at: http://www.w3.org/TR/wsdl.
See the WS-I at: http://www.ws-i.org/ and in particular the WS-I Basic Profile under http://www.ws-i.org/deliverables.
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