What are the elements of a WSDL document?

A WSDL document is an XML document that consists of a set of definitions. It indicates how potential clients are intended to interact with that service. Thus, a WSDL document that describes a particular Web service represents an assertion that the described service fully implements and conforms to what the WSDL document describes. The document contains the following elements:

1. types: It describes the definitions for data types and how the message will exchange the data.
2. message: It provides an abstract definition of the data being transmitted. It consists of one or more logical parts. Each part contains a name and an optional element and type attributes.
3. portType: It defines the set of abstract operations that consists of the input and output messages.
4. binding: It defines the protocol to be used and specifies the data format for the operations and messages defined by a specific portType.
5. port: A port defines the individual endpoint by specifying a single address for binding. It refers to the binding and extensibility element that is used to specify the address information.
6. service: It aggregates a set of related ports. It specifies an address for binding.

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