WSDL - <message> Element


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  • The <message> element describes the data being exchanged between the web service providers and the consumers.

  • Each Web Service has two messages: input and output.

  • The input describes the parameters for the web service and the output describes the return data from the web service.

  • Each message contains zero or more <part> parameters, one for each parameter of the web service function.

  • Each <part> parameter associates with a concrete type defined in the <types> container element.

Let us take a piece of code from the WSDL Example chapter:

<message name="SayHelloRequest">
   <part name="firstName" type="xsd:string"/>
</message>

<message name="SayHelloResponse">
   <part name="greeting" type="xsd:string"/>
</message>

Here, two message elements are defined. The first represents a request message SayHelloRequest, and the second represents a response message SayHelloResponse.

Each of these messages contains a single part element. For the request, the part specifies the function parameters; in this case, we specify a single firstName parameter. For the response, the part specifies the function return values; in this case, we specify a single greeting return value.



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