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the assumption that there is one-to-one correspondence between the elements from the XML Schema and the concepts from the ontology. In the case of one-to-many or many-to-one correspondences top level annotation method has to be used. Although it is a more complex method, its advantage is that it allows for complex mappings to be speci ed between the XML element and the domain ontology. The semantic of the elements in the complex type is captured by using the schemaMapping attribute.
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10.6.2.2. Annotating the Operation Elements The operations of a Web service can be annotated with preconditions, which represent a set of assertions that must hold before the execution of that operation. The precondition extension element is de ned as follows:  /precondition: Denote the precondition for the parent operation;  /precondition/@name: Uniquely identi es the precondition among the other preconditions de ned in the WSML document;  /precondition/@modelReference: Points to that parts of the semantic model that describes the precondition of this operation;  /precondition/@expression: Contains the precondition associated to the parent operation. Its format directly depends on the semantic representation language used. The two ways of specifying the precondition assertions, /precondition/@expression, and /precondition/ @modelReference are mutually exclusive. For each operation there is only one precondition allowed. This restriction is adopted as an attempt to keep the speci cation simple. If one needs more than one precondition, the solution is to de ne in the domain ontology the complex expressions and conditions and to point to them using the modelReference attribute. The effects de ne the result of invoking a particular operation. The effect element is de ned in a similar manner as the precondition (see above), and it is allowed to have one or more effects associated with one operation. 10.6.2.3. Service Categorization Adding categorization information to the Web service can be helpful in the discovery process. That is, by categorizing the published Web services can narrow the range of the candidate Web services. Multiple category elements can be used to state that a Web service falls in multiple categories as one category elements speci es one categorization.
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SEMANTIC WEB SERVICES APPROACHES AND PERSPECTIVES
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10.7. SEMANTIC WEB SERVICES GROUNDING: THE LINK BETWEEN THE SWS AND EXISTING WEB SERVICES STANDARDS
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As we have pointed in the previous sections, the ultimate aim of SWS automatic execution of tasks like discovery, negotiation, composition, invocation of services requires semantic description of various aspects of Web services. For example, the process of Web service discovery can be automated if we have a machine-processable description of what the user wants (a user goal) and what the available services can do (service capabilities). We call this kind of information semantic description of Web services. However, currently deployed Web services are generally described only on the level of syntax, specifying the structure of the messages that a service can accept or produce. In particular, Web Service Description Language (WSDL, 2005) describes a Web service interface as a set of operations where an operation is only a sequence of messages whose contents are constrained with XML Schema (2004). We call this the syntactic description of Web services. Certain tasks require that semantic processors have access to the information in the syntactic descriptions, for example to invoke a discovered service, the client processor needs to know how to serialize the request message. Linking between the semantic and the syntactic description levels is commonly called grounding. In order for SWS to be widely adopted, they must provide mechanisms that build on top of existing, widely adopted technologies. In this Section we look at such mechanisms and discuss the general issues of Semantic Web Service grounding (in Section 10.7.1); we also identify two major types of grounding, so in Section 10.7.2 we talk about data grounding and in Section 10.7.3 we talk about grounding behavior descriptions.
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