The WSDL stands for Web Services Description Language. It is an XML document containing information about web services such as method name, method parameter. The Client needs a data dictionary which contains information about all the web services with methods names and parameters list to invoke them for the web services. The Web Service Description Language bridge up this gap, by providing all necessary information to the client.
Some Important elements used in Web Services Description language are as follows :
<message> : The message element in WSDL is used to define all different data elements for each operation performed by the web service.
<portType> : The port type element is used to determine the operation which can be performed by the web service. This operation can have two messages one is input and the second one is the output message.
<binding> : This element contains the used protocol.
