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WSDL is a XML way of describing a Web Service. It specifies the location of Web Service and methods available with the service. WSDL is basically a document written in XML. A WSDL document has <portType>, <message>, <types > and <binding> as the elements.
The typical syntax of a WSDL document is as shown below

<definitions>
<types>
definition of types....
</types>
<message>
definition of message....
</message>
<portType>
definition of portType....
</portType>
<binding>
definition of binding....
</binding>
<service>
definition of service....
</service>
</definitions>