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Figure 11-6 The publish-subscribe Web services scenario Branches subscribe by exposing a Web service that implements a pre-defined interface For the client application to find all store Web services, it consults UDDI At runtime, the client asks UDDI for a list of services that implement the RetailPricing interface (assuming HQ already registered this interface with UDDI) As each new store comes online, it simply registers its interface with UDDI and the next time the client runs it will automatically find the new store and push pricing information to it as shown in figure 11-7
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Figure 11-7 UDDI and the publish/subscribe scenario This pattern can be effective in many scenarios where an application needs to push content to many subscribing applications Instead of managing subscribtions yourself, you rely on UDDI to manage them for you
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Main Data Structures
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Information registered with UDDI is represented by XML documents containing structures described in UDDI s XML Schema[2] There are four key data structured core to most UDDI usage scenarios Figure 11-8 shows these four structures and two additional structures and the relations between them
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Figure 11-8 The main UDDI data structures The businessEntity data structure is used to represent a business or, more generally, a service provider Each businessEntity may contain services represented by businessService structures A businessService contains bindingTemplates which point to tModel structures (more on this later) Businesses might be related (eg a parent-child business relation) using publisherAssertion structure Listing 11- 1 shows part of the UDDI XML Schema which contains the formal definitions of the above XML structures
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Listing 11-1 XML Schema types and element declarations for the main UDDI data structures (VBWSClientCode\11\UDDISchemas\uddi_v2xsd)
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<!-- businessEntity structure --> <element name="businessEntity" type="uddi:businessEntity"/> <complexType name="businessEntity"> <sequence> <element ref="uddi:discoveryURLs" minOccurs="0"/> <element ref="uddi:name" maxOccurs="unbounded"/> <element ref="uddi:description" minOccurs="0" maxOccurs="unbounded"/> <element ref="uddi:contacts" minOccurs="0"/> <element ref="uddi:businessServices" minOccurs="0"/> <element ref="uddi:identifierBag" minOccurs="0"/> <element ref="uddi:categoryBag" minOccurs="0"/> </sequence> <attribute name="businessKey" use="required" type="uddi:businessKey"/> <attribute name="operator" use="optional" type="string"/> <attribute name="authorizedName" use="optional" type="string"/> </complexType>
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<!-- businessService structure --> <element name="businessService" type="uddi:businessService"/> <complexType name="businessService"> <sequence> <element ref="uddi:name" maxOccurs="unbounded"/> <element ref="uddi:description" minOccurs="0" maxOccurs="unbounded"/>
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<element ref="uddi:bindingTemplates"/> <element ref="uddi:categoryBag" minOccurs="0"/> </sequence> <attribute name="serviceKey" use="required" type="uddi:serviceKey"/> <attribute name="businessKey" use="optional" type="uddi:businessKey"/> </complexType>
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<!-- bindingTemplate structure --> <element name="bindingTemplate" type="uddi:bindingTemplate"/> <complexType name="bindingTemplate"> <sequence> <element ref="uddi:description" minOccurs="0" maxOccurs="unbounded"/> <choice> <element ref="uddi:accessPoint" minOccurs="0"/> <element ref="uddi:hostingRedirector" minOccurs="0"/> </choice> <element ref="uddi:tModelInstanceDetails"/> </sequence> <attribute name="serviceKey" use="optional" type="uddi:serviceKey"/> <attribute name="bindingKey" use="required" type="uddi:bindingKey"/> </complexType>
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<!-- tModel structure -->
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<element name="tModel" type="uddi:tModel"/> <complexType name="tModel"> <sequence> <element ref="uddi:name"/> <element ref="uddi:description" minOccurs="0" maxOccurs="unbounded"/> <element ref="uddi:overviewDoc" minOccurs="0"/> <element ref="uddi:identifierBag" minOccurs="0"/> <element ref="uddi:categoryBag" minOccurs="0"/> </sequence> <attribute name="tModelKey" use="required" type="uddi:tModelKey"/> <attribute name="operator" use="optional" type="string"/> <attribute name="authorizedName" use="optional" type="string"/> </complexType>
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businessEntity Each business registered with UDDI is represented via a businessEntity data structure Think of this entity as the starting point for your relationship with UDDI: When you publish your services to UDDI, you start by publishing a new businessEntity Similarly, when searching UDDI, many of the inquiry APIs search a specific businessEntity Figure 11-8 shows the businessEntity structure and its contents and listing 11-1 shows the corresponding XML Schema complex type definition Listing 11-2 shows an example businessEntity structure from Microsoft s UDDI v2 implementation
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Listing 11-2 An example businessEntity structure
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<businessEntity businessKey="677cfa1a-2717-4620-be39-6631bb74b6e1" operator="Microsoft Corporation" authorizedName=" Yasser Shohoud : 86"> <discoveryURLs> <discoveryURL useType="businessEntity">
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http://uddirtemicrosoftcom/discovery businessKey=677cfa1a-2717-4620-be39-6631bb74b6e1 </discoveryURL> </discoveryURLs> <name xml:lang="en">LearnXmlWS: The Resource for Web Service Developers</name> <description xml:lang="en">An online community for developers of Web services and Web service applications Read articles, download code, and ask questions pertaining to Web services Created by Yasser Shohoud </description> <businessServices> <businessService serviceKey="d8091de4-0a4a-4061-9979-5d19131aece5" businessKey="677cfa1a-2717-4620-be39-6631bb74b6e1"> <name xml:lang="en">The Weather service</name> <description xml:lang="en"> Returns the current weather conditions for a given zip code </description> <bindingTemplates> <bindingTemplate bindingKey="942595d7-0311-48b7-9c65-995748a3a8af" serviceKey="d8091de4-0a4a-4061-9979-5d19131aece5"> <accessPoint URLType="http"> http://wwwLearnXmlWScom/services/weatherRetrieverasmx </accessPoint> <tModelInstanceDetails> <tModelInstanceInfo tModelKey="uuid:42fab02f-300a-4315-aa4a-f97242ff6953"> <instanceDetails> <overviewDoc> <overviewURL>
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http://wwwlearnxmlwscom/services/weatherretrieverasmx WSDL </overviewURL> </overviewDoc> </instanceDetails> </tModelInstanceInfo> </tModelInstanceDetails> </bindingTemplate> </bindingTemplates> </businessService> </businessServices> </businessEntity>
Each businessEntity is uniquely identified by a UUID (Universally Unique Identifier) called a businessKey The operator assigns this businessKey to the businessEntity when it s published The publisher also optionally saves the name of the person who published the businessEntity in the authorizedName attribute A businessEntity may have one or more discoveryURL elements which contain URLs that point to discovery documents In this context, the name discovery document has nothing to do with Web services, it is simply a document that provides information about the business itself When you register a new business, the operator will automatically add to it a discoveryURL that points to the businessEntity information on that operator s node For example, if you open Internet Explorer and navigate to the discoveryURL from listing 11-2, http://uddirtemicrosoftcom/discovery businessKey=677e1 [3], you will get back an XML document that contains the LearnXmlWS businessEntity definition like the one in listing 11-2 You can also add your own discovery URLs, perhaps a link to your company s home page or some other document that provides more information about the business To help differentiate the types of URLs, the useType attribute can be set to a value that identifies the type of document returned by the discovery URL UDDI defines only two useType values: businessEntity and businessEntityEx When useType is businessEntity, it means that navigating to the discovery URL will get you an XML document that contains a UDDI businessEntity structure Similarly, when useType is businessEntityEx, the discovery URL will get you an XML document that contains a UDDI businessEntityEx structure businessEntityEx is similar to businessEntity but allows third parties to extend it by adding their own XML elements to the structure Each businessEntity will also have one or more name and zero or more descriptions Multiple names and descriptions are allowed to support multiple languages If multiple names are specified, each must have an xml:lang attribute indicating the language used and each must be in a unique language, ie you cannot specify two names in the same language The same language rules apply to description Note that businessEntity names need not be unique across all businessEntities, so its likely that some businesses registered with UDDI will have the same name businessKey is considered the only unique identifier for a businessEntity A businessEntity may optionally contain a contacts structure used to hold contact information such as mailing address, phone, and email [4] A contacts structure can contain multiple contact structures for different uses such as technical support, sales, investors, etc identifierBag and categoryBag are two data structures used to add identification and categorization information to a businessEntity I will explain these structures in more detail later in this chapter for now, keep in mind that identifierBag is a structure used to add identification information such as a Federal