[WSDL 2.0 Term] Types [Description] Describes the data. The XML Schema language (also known as XSD) is used (inline or referenced) for this purpose. [WSDL 1.1 Term] 
Types
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