Using WSDL to define business services
A service, as defined by a WSDL document, is made up of two parts. Firstly, there is the abstract part, which defines the individual operations that make up a service, the messages that define the parameters for the operations, and the types which define our XML data types used by our messages.
The second part of the WSDL document defines the binding, that is, how to physically encode the messages on the wire (for example, SOAP), the transport protocol on the wire (for example, HTTP), and also the physical location or endpoint of the service (for example, its URL).
Ideally, we should only be concerned with designing the abstract part of the WSDL document, as the runtime binding should be more of a deployment ...
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