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• <portType>- This basically involves a set of operation and messages involved in each operation. <portType name=""> defines a unique name. In our example <wsdl:portType name="HelloWorld"> suggest a unique name. Each portType has an associated <operation name=""> element which suggest an operation name. In our example <wsdl:operation name="hello"> suggests an operation name. Each operation element can have <input>, <output> or both the tags accordingly it will be one-way, notification or request-response operation. Our example has <wsdl:input message="intf:helloRequest" name="helloRequest"/> which uses the helloRequest as the input message and <wsdl:output message="intf:helloResponse" name="helloResponse"/> which uses the helloResponse as the output message.

• <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.