[WSDL 2.0 Term] Interface [Description] Defines a Web service, the operations that can be performed, and the messages that are used to perform the operation. [WSDL 1.1 Term] 
PortType
S e r v i c e
P o r t
B i n d i n g
P o r t T y p e
O p e r a t i o n
M e s s a g e
T y p e s