visual basic barcode generator tModel tModel is short for technical model. This data type is used to in Java

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tModel tModel is short for technical model. This data type is used to
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or standard or some specific convention. A tModel helps a client of a service to interact properly with the service. In other words, a tModel provides a technical specification for a fingerprint that helps the client determine whether the technical capabilities of the service meets its requirement. The second role of a tModel is that it represents a value system to identify and categorize information entities. This role is discussed later in more detail.
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publisherAssertion This data type complements the information contained in the businessEntity data type. It is especially useful for very large organizations that have many subsidiaries and may not be adequately represented by the businessEntity data type. The publisherAssertion data type is used to describe relationships between business entities. Figure 14.2 schematically describes the relationships among the five data types of the UDDI data model. businessEntity serves as the
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businessEntity Information about a service provider n Namespace reference
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businessService Descriptive information about a particular service n
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tModel Technical fingerprint specification and taxonomies
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bindingTemplate Technical information about a service and endpoint specification
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Service type reference
Namespace reference
publisherAssertion Information about relationship between parties
Relationships among the ve entities of the UDDI data model
UDDI Registry
container of businessServices, which means there can be several businessServices belonging to a given businessEntity, but a businessService can belong to only one businessEntity. In a similar manner, there is containment relationship between businessService and bindingTemplate. Therefore, a bindingTemplate can belong only to a single businessService, but a businessService can have more than one bindingTemplate. It is clear from Figure 14.2 that tModel has fundamentally different relationships. It does not have a containment relationship with the other elements; rather, it is always referenced from other elements. Also, tModel is referenced in different roles by different elements. businessEntity, businessService, tModel, and publisherAssertion refer to a tModel as a namespace, whereas bindingTemplate refers to it as a service type. An interesting thing to notice is the use of tModel to refer to itself like a namespace for classification or taxonomy. Because of the special and different roles a tModel plays, we discuss the tModel data structure in more detail next. tModel The tModel fulfills two important goals of the UDDI registry. The first goal is to provide a facility to describe Web Services well enough that a consumer of a service can interact with the service in a well-defined manner. The second goal is to provide a means to describe Web Services well enough that the description is useful during searches. The first goal is met by tModel via the technical fingerprint of a service, whereas the second goal is met by tModel by acting in the role of a namespace or taxonomy. We discuss these two roles next.
Technical Fingerprint Role
The specification of how a consumer interacts with a service is stored in the tModel. In this role, the tModel acts as service type. An example might be a specification that refers to the wire protocol and interchange formats, such as SOAP over HTTP. After standard protocol definitions such as these are registered as a tModel, services can express their compliance with them by referring to them in the bindingTemplate. A common use of the technical fingerprint involves referring to a Web Service WSDL in the bindingTemplate (which is described later in this chapter). Listing 14-1 provides an example of a tModel registered in a UDDI registry. This model pertains to a credit-check protocol. The model refers to a WSDL document in the overviewURL element. This illustrates an important point about tModel when used as a technical fingerprint. The tModel only stores metadata and not the actual data. In Listing 14-1, the tModel points to a WSDL document rather than storing the information itself. Also note that the UDDI registry assigns
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a universally unique identifier (UUID) to the tModel it stores. This identifier appears as the value of the attribute tModelKey. In our example, this attribute value is AAAAAAAA-1234-5678-AAAA.
Listing 14-1
Listing 14.1: An example of tModel used as a service fingerprint 1 <tModel xmlns="urn:uddi-org:api" 2 tModelKey="UUID:AAAAAAAA-1234-5678-AAAA"> 3 <name>myCompany:creditcheck</name> 4 <description xml:lang="en">Check credit</description> 5 <overviewDoc> 6 <overviewURL>http://myComapny.schema.com/creditcheck.wsdl 7 </overviewURL> 8 </overviewDoc> 9 <categoryBag> 10 <keyedReference 11 tModelKey="UUID:CD153257-086A-4237-B3366BDCBDCC6635" 12 keyName="Consumer credit reporting services" 13 keyValue="95.21.22.176.234"/> 14 <keyedReference 15 tModelKey="UUID:C1ACF26D-9672-4404-9D7039B756E62AB4" 16 keyName="types" 17 keyValue="wsdlSpec"/> 18 </categoryBag> 19 </tModel
Once a tModel has been registered in a UDDI registry and a service wants to adhere to the WSDL referenced in the tModel, the service can indicate this by referencing the tModel in the bindingTemplate using the identifier, as shown in Listing 14-2 (bindingTemplate is explained later in the chapter).
Listing 14-2
Listing 14.2: Example of a bindingTemplate referencing a tModel 1 <bindingTemplates> 2 <bindingTemplate 3 serviceKey="CCCCCCCC-CCCC-CCCC-CCCC " 4 bindingKey="DDDDDDDD-DDDD-DDDD-DDDD "> 5 <accessPoint URLType="https"> 6 https://myCompany.com/creditcheck 7 </accessPoint> 8 <tModelInstanceDetails> 9 <tModelInstanceInfo 10 tModelKey="UUID: AAAAAAAA-1234-5678-AAAA "/> 11 </tModelInstanceDetails>
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