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• <bindings>- A binding defines message format and protocol details for operation and message defined by each portType. Each binding element is identified by a unique name attribute which can be any user defined name. The type element defines the portType referenced by binding. In our case <wsdl:binding name= "HelloWorldSoap Binding" type="intf:HelloWorld"> defines a binding with a unique name and HelloWorld portType associated with it. The soap:binding element has style attribute which can be either RPC-oriented(messages containing parameters and return values) or document-oriented(message containing documents). The default value for this element is document. The other element is transport which suggests the transmission protocol used. In our example we have <wsdlsoap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/> document as the style and http as the transport protocol. <wsdl:operation name="hello"> name defines operation associated with each portType. Each operation will have a a soapAction associated with it. <wsdl:input name="helloRequest"> define the input for the operation and <wsdlsoap:body use="literal"/> defines the encoding standard. In our example we are using literal as the encoding standard.

• <service>- Service element defines where the service can be accessed. Each service is associated with a unique name which is suggested by <wsdl:service name="HelloWorldService"> in our example. The next element <wsdl:port binding="intf:HelloWorldSoapBinding" name="HelloWorld"> suggests the previous binding which will be used by service. The element <wsdlsoap:address location="http://localhost:8080/SimpleWeb/services/HelloWorld"/> suggests the physical address through which a service can be accessed.

This completes an overview on WSDL.