WSDL Version 2.0
- Interface (what): abstract model of the service, along with
the message patterns;
Message-oriented, inheritance, RPC style, message patterns.
- Interface binding (how): binds the abstract model to a concrete
protocol;
SOAP 1.2 (over HTTP 1.1), HTTP 1.1 bindings.
- Implementation (where): Access point of the service.
- Extension can be marked as mandatory
