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Use of WSDL in the UDDI Registry Recall from 13 that the WSDL document consists of a service interface part and a service implementation part. You learned earlier in this chapter that the bindingTemplate and tModels also provide the same information. Therefore, it may be possible that the bindingTemplate and tModels can delegate this information to a WSDL document. It turns out that this is possible if the WSDL document is authored or partitioned in a particular way. This particular way of partitioning a WSDL document is slightly different from the partitions we talked about in 13. In this way of grouping, you group the portType and binding elements in one file, which we will refer to as the WSDL interface and binding file. The service element containing the port elements is grouped in another file, which we will refer to as the WSDL implementation file. This implementation file imports the WSDL interface and binding file.
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As an example, let s again consider the weather forecast service. We name the WSDL interface and binding file weatherServiceInterface .wsdl, and we call the WSDL implementation file weatherServiceImpl .wsdl. Listing 14-3 provides the implementation file that imports the interface and binding file.
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Listing 14-3
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Listing 14.3: An Example of a WSDL implementation file which imports the interface and binding file 1 <definitions name="weatherService" 2 targetNamespace=http://myCompany.com/weather.wsdl 3 xmlns:tns=http://myCompany.com/weather.wsdl 4 xmlns:SOAP-EXT=http://schemas.xmlsoap.org/wsdl/soap/ 5 xmlns:imported=http://myCompany.com/ns/weatherInterface/wsdl 6 xmlns=http://schemas.xmlsoap.org/wsdl/ 7 <import location= 8 http://www.myCompany.com/wsdlFiles/ weatherServiceInterface.wsdl 10 namespace=http://myCompany.com/ns/ weatherServiceInterface.wsdl/> 11 <!-- The service element containing ports elements go here - - > 12 .. 13 </definitions>
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In this WSDL implementation file, the location attribute of the import element carries the physical location of the imported interface and binding file. The namespace prefix imported refers to the target namespace of the elements contained in the interface and the binding file named weatherServiceInterface.wsdl. Now that we have discussed this particular partition of the WSDL file, we are in a position to discuss how to refer to the WSDL files in a tModel and in a bindingTemplate for registering a Web Service in a UDDI registry. For tModel, we refer to the WSDL interface and binding file, whereas with the bindingTemplate we refer to the WSDL implementation file. In case of the tModel, a uddi-org:types taxonomy value of wsdlSpec classifies the tModel to refer to the WSDL interface and binding document. This value is specified in the categoryBag element of the tModel. The URL of the WSDL interface and binding document is contained in the value of the overviewURL element, which is a subelement of the overviewDoc element. Let s continue with the weather service example. Listing 14-4 shows how the reference to the WSDL interface and binding document is made (see lines 7 9). Note that the value of the tModelKey attribute in the keyedReference element is a UUID and points to a tModel representing
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Fourteen
the UDDI built-in uddi-org:types category system. The keyName and keyValue attributes determine that this weather service tModel is a link to a WSDL document.
Listing 14-4
Listing 14.4: a tModel containing a reference to the WSDL interface and binding document 1 <tModel tModelKey=" ."> 2 <name> Weather service tModel </name> 3 <description>This example illustrates the reference to a WSDL 4 interface and binding file in a tModel 5 </description> 6 <overviewDoc> 7 <overviewURL> 8 http://www.myCompany.com/wsdlFiles/weatherServiceInterface.wsdl 9 </overviewURL> 10 </overviewDoc> 11 <categoryBag> 12 <keyedReference 13 tModelKey="uuid:CDDCF34D-1234-4404-9D40-41C842G32sd7" 14 keyName="uddi-org:types" 15 keyValue="wsdlSpec"/> 16 </categoryBag> 17 </tModel>
Next, let s look at how the WSDL implementation document is referred to in a bindingTemplate. Note that the accessPoint element of the bindingTemplate directly holds the exact network address of the Web Services, as shown in Listing 14-5.
Listing 14-5
Listing 14.5: Network address of a Web Service encoded directly in the bindingTemplate 1 <bindingTemplate bindingKey=" " servicekey=" "> 2 <description> Weather service bindingTemplate</description> 3 <accessPoint URLType="http"> 4 http://www.myCompany.com/servlets/weatherServlet 5 </accessPoint> 6 <!- tModelInstanceDetails goes in here - - > 7 </bindingTemplate>
Because the accessPoint completely holds the information on the Web Services network address, there is no need to replicate this information elsewhere. Therefore, the attachment of the WSDL implementation document, which also carries the network address of the Web Services, is not required. However, to illustrate how a WSDL implementation document
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