Designing a Service's Interaction Layer
Literal bindings cannot represent complex types, such as objects with circular 
references, in a standard way.
Code Example 3.14 shows a snippet from the WSDL document illustrating
how the sample weather service specifies these bindings.
transport="http://schemas.xmlsoap.org/soap/http" />
Code Example 3.14
Specifying WSDL Bindings
It is important to keep in mind these message styles and bindings, particularly
when you design the interface using the WSDL to Java approach and when you
design the WSDL for your service. When you use the Java to WSDL approach,
you rely on the vendor provided tools to generate the WSDL for your Java inter 
faces, and they can be counted on to create WS I compliant WSDL for your ser 
vice. However, note that some vendors may expect you to specify certain options
to ensure the creation of a WS I compliant WSDL. For example, the J2EE 1.4
SDK from Sun Microsystems provides a 
 tool, which expects the devel 
oper to use the 
 flag to create the WS I compliant WSDL for the service. It
is also a good idea to check the WSDL document itself to ensure that whatever
tool you use created the document correctly. 

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