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What Is WSDL ?

Web Services Description Language:
WSDL is defined as WSDL is an XML format for describing network services as a set of endpoints operating on messages containing either document-oriented or procedure-oriented information. The operations and messages are described abstractly, and then bound to a concrete network protocol and message format to define an endpoint. Related concrete endpoints are combined into abstract endpoints (services).

WSDL is having five parts..
1. WSDL definition
2. Types
3. Messages
4. PortType
5. Binding

WSDL architecture

Typically WSDL is a XML document having definition at the root and type ,Message,PortType,Binding as child elements.
<types> tag defines data types used by the web service in XML Schema.Even the schema can be defined as a child element of <types>. This can be imported from external URL

<Message> tag defines the representation of all messages. More over that is abstruct in nature.

<PortType> tag is also an abstruct represenatation of the operations. It also depicts the message exchange patterns. This is represented as public methods used by a program. All input,output parameters are represented as a message.

<binding> tag connects web service interfaces into a physical transport protocol.

WSDL follows SOAP processing nodes with the following message exchange pattern(MEP)
1. Request response(Service consumer transmits a message to service provider,Provider should respond to the request.)
2. Fire and forget(Service consumer transmits a message to service provider but does not expect a response from service provider.like ping service )
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