The root of a WSDL document is provided by a definitions element.
The WSDL Document Structure
WSDL is used to describe Web services.
The document describes a web service using these major elements.
Element
Defines
<portType>
The most important WSDL element. It defines a web service, the
operations that can be performed, and the messages that are involved.
<message>
The <message> element defines the data elements of an operation.
Each messages can consist of one or more parts.
<types>
The <types> element defines the data types that are used by the
web service. For maximum platform neutrality, WSDL uses XML Schema syntax
to define data types.
<binding>
The <binding> element defines the message format and
communication protocol details for each port. It links the port type to a
transport method eg. HTTP
A WSDL document can also contain other elements,
like extension elements and a service element that makes it possible
to group together the definitions of several web services in one single WSDL document.
The main structure of a WSDL document looks like this:
<definitions>
<types>
definition of
types........
</types>
<message>
definition of a
message....
</message>
<portType>
definition of a
port.......
</portType>
<binding>
definition of a
binding....
</binding>
</definitions>
Port type
an abstract set of operations mapped to one or more end points,
defining the collection of operations for a binding; the collection of operations,
because it is abstract, can be mapped to multiple transports through various bindings.
It is the most important WSDL element.
Message
An abstract definition of the data, in the form of a message presented
either as an entire document or as arguments to be mapped to a method invocation
types
It defines the data type that are used by the web service.
For maximum platform neutrality, WSDL uses XML Schema syntax to define data types.
Binding
The concrete protocol and data formats for the operations and messages
defined for a particular port type
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