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<h1>WSDL Documents</h1>
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<p class="intro">A WSDL document is just a simple XML document.</p>
<p class="intro">It contains set of definitions to describe a web service.</p>
<hr />
<h2>The WSDL Document Structure</h2>
<p>A WSDL document describes a web service using these major elements:</p>
<table border="1" class="ex" width="100%">
<tr>
<th align="left" width="20%">Element</th>
<th align="left" width="80%">Defines</th>
</tr>
<tr>
<td valign="top"><portType></td>
<td valign="top">The operations performed by the web service</td>
</tr>
<tr>
<td valign="top"><message></td>
<td valign="top">The messages used by the web service</td>
</tr>
<tr>
<td valign="top"><types></td>
<td valign="top">The data types used by the web service</td>
</tr>
<tr>
<td valign="top"><binding></td>
<td valign="top">The communication protocols used by the web service</td>
</tr>
</table>
<p>The main structure of a WSDL document looks like this:</p>
<table width="100%" border="1" class="ex" cellspacing="0">
<tr>
<td>
<pre><definitions>
</pre>
<pre><types>
<b> definition of types........
</b></types>
<message>
<b> definition of a message....
</b></message>
<portType>
<b> definition of a port.......
</b></portType>
<binding>
<b> definition of a binding....
</b></binding>
</definitions></pre>
</td>
</tr>
</table>
<p>A WSDL document can also contain other elements, like extension elements and
a service element that makes it possible to group together the definitions of
several web services in one single WSDL document.</p>
<p>For a complete syntax overview go to the chapter <a href="wsdl_syntax.asp">WSDL Syntax</a>.</p>
<hr />
<h2>WSDL Ports</h2>
<p>The <b><portType></b> element is the most important WSDL element. </p>
<p>It describes a web service, the operations that can be performed, and the messages that are involved.</p>
<p>The <portType> element can be compared to a function library (or a module, or a class)
in a traditional programming language.</p>
<hr />
<h2>WSDL Messages</h2>
<p>The <b><message></b> element defines the data elements of an operation.</p>
<p>Each message can consist of one or more parts. The parts can be compared
to the parameters of a function call in a traditional programming language. </p>
<hr />
<h2>WSDL Types</h2>
<p>The <b><types></b> element defines the data type that are used by
the web service.</p>
<p>For maximum platform neutrality, WSDL uses XML Schema
syntax to define data types.</p>
<hr />
<h2>WSDL Bindings</h2>
<p>The <b><binding></b> element defines the message format and protocol details
for each port.</p>
<hr />
<h2>WSDL Example</h2>
<p>This is a simplified fraction of a WSDL document:</p>
<table width="100%" border="1" class="ex" cellspacing="0">
<tr>
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