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TABLE 13.1
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The types element is the container of all the abstract data types. Parts may pick up individual type definitions out of this container. It is important to note that the parts do not have to use the abstract data types defined in the types container element. Instead, types definitions can be directly attached to the parts definition. Note that the abstract data type inputType and outputType definitions employ XML-type schema definitions. However, the WSDL specification allows other types systems to be used. Table 13.1 summarizes what we have covered about the abstract interface definition part of WSDL. Next, we discuss the WSDL service implementation description, which is required in order for the service consumer to find out about the concrete network address and communication protocol for the service. For the weather service, Listing 13-2 shows the implementation description part of the WSDL document.
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Listing 13-2
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Listing 13.2: Example of a service implementation description 1 <binding name="weatherServiceSoapBinding" 2 type="tns:WeatherServicePortType"> 3 <SOAP-EXT:binding style="rpc" 4 transport=http://schema.xmlsoap.org/soap/http/> 5 <operation name="getWeather"> 6 <SOAP-EXT:operation saopAction=""/> 7 <input> 8 <SOAP-EXT:body use="encoded"/> 9 </input> 10 <output> 11 <SOAP-EXT:body use="encoded"/> 12 </output> 13 </operation> 14 </binding> 15 <service name= "WeatherService">
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<port name="WeahterServicePort" binding="tns:WeatherServiceSoapBinding"> <SOAP-EXT:address location=http://myComapny.com/servlet/rpcrouter/> </port> </service> </definitions>
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In this implementation description, the main element is the binding element. It associates the abstract interface description to a specific implementation. It contains information about the transport protocol and the concrete data format employed by the service. In this listing, the binding associates the abstract port type WeatherServicePortType to a specific port named WeatherServicePort. For this purpose, the binding name WeatherServiceSoapBinding (compare codes on lines 1 2 and lines 15 16) is used. In this example, we are using SOAP over HTTP, as indicated by code line 4. In addition, we are employing an RPC interaction style. This is indicated by setting the attribute style to rpc on line 3. The abstract operation from the service interface description getWeather (see Listing 13-1) is mapped to concrete SOAP messages (lines 7 12). Furthermore, the input and output messages are SOAP encoded for transfer. It should be noted that the SOAP binding associated elements, which are identified by the prefix SOAP-EXT, extend the WSDL-defined elements. For each protocol, such as SOAP, a different binding is defined to describe the mapping from the abstract WSDL interface description to the concrete protocol description. These are called extensibility elements. An important element of the implementation description is the port element, which is used to provide a network address for the service. A service client may bind to a port and invoke methods on the service according to the concrete data format specified in the WSDL document. The same service may be offered at different ports that use different data formats. A client may choose between the different ports. It is important to note that the port and binding have been separated. This is because the binding is reusable, and multiple ports can use the same binding. Finally, a service element encapsulates all the ports. This service element may be a starting point for a service client to discover the service. Table 13.2 summarizes the part of the WSDL document that describes service implementation: Figure 13.1 shows schematically the relationships among the different elements of the service implementation description as well their relationships to the abstract port type. In the next section, we take a brief look at the overall structure of a WSDL document.
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Thirteen Summary of Service Implementation Elements in WSDL Description A binding element binds a port type to a speci c transport protocol and data format. A port describes the network address of a particular implementation of the service. A service element encapsulates all the available ports. These ports may share the same service types but employ different network addresses. There may also be concrete service implementations of several port types.
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