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A WSDL document is made up of the following elements:
definitions — The root element of a WSDL document. The attributes of this element specify the name of
the WSDL document, the document’s target namespace, and the shorthand definitions for the namespaces referenced in the WSDL
document.
types — The XML Schema definitions for the data units that
form the building blocks of the messages used by a service. For information about defining
data types see Defining Logical Data Units.
message — The description of the messages exchanged during
invocation of a services operations. These elements define the arguments of the operations
making up your service. For information on defining messages see Defining Logical Messages Used by a Service.
portType — A collection of operation elements describing the logical interface of a service. For information
about defining port types see Defining Your Logical Interfaces.
operation — The description of an action performed by a
service. Operations are defined by the messages passed between two endpoints when the
operation is invoked. For information on defining operations see Operations.
binding — The concrete data format specification for an
endpoint. A binding element defines how the abstract messages
are mapped into the concrete data format used by an endpoint. This element is where
specifics such as parameter order and return values are specified.
service — A collection of related port elements. These elements are repositories for organizing endpoint
definitions.
port — The endpoint defined by a binding and a physical
address. These elements bring all of the abstract definitions together, combined with the
definition of transport details, and they define the physical endpoint on which a service
is exposed.
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