The role of elements in WSDL

Elements in WSDL

Here are the major elements of Web service Description Language (WSDL)

1. <definitions> = Root WSDL Elements
2. <types> = What data type will be transmitted?
3. <message> = What exact information is expected
4. <portType> = What operations will be supported
5. <binding> = How will the message will be transmitted on the wire ? What SOAP specific details are there
6. <service> = Define the collection of ports that make up the services and where is service located.

See more about WSDL

Reference WIKI