<div dir="ltr" style="text-align: justify;">
<ul>
<li>The <b><;message>;</b> element describes the data being exchanged between the Web service providers and consumers.</li>
<li>Each Web Service has two messages: input and output.</li>
<li>The input describes the parameters for the Web Service and the output describes the return data from the Web Service.</li>
<li>Each message contains zero or more <b><;part>;</b> parameters, one for each parameter of the Web Service&#8217;s function.</li>
<li>Each <b><;part>;</b> parameter associates with a concrete type defined in the <b><;types>;</b> container element.</li>
</ul>
<h2><b>Lets take a piece of code from the Example Session:</b></h2>
<pre class="highlight"><;message name="SayHelloRequest">; 
 <;part name="firstName" type="xsd:string"/>; 
 <;/message>; 
 <;message name="SayHelloResponse">; 
 <;part name="greeting" type="xsd:string"/>; 
 <;/message>; 
</pre>
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<p>Here, two message elements are defined. The first represents a request message <i><b>SayHelloRequest</b></i>, and the second represents a response message <i><b>SayHelloResponse</b></i>.</p>
<p>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 <i><b>firstName </b></i>parameter. For the response, the part specifies the function return values; in this case, we specify a single greeting return value.</p>
<p><i><b>References</b></i><br />
<i><b><a href="http://en.wikipedia.org/wiki/Web_Services_Description_Language" target="_blank" rel="noopener">Wikipedia for WSDL</a></b></i></p>
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