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10.6. THE WSDL-S APPROACH
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WSDL-S (Akkiraju et al., 2005) proposes a mechanism to augment the Web service functional descriptions, as represented by WSDL (WSDL, 2005), with semantics. This work is a re nement of an initial proposal developed by the Meteor-S group, at the LSDIS Lab15, Athens, Georgia. In this section we brie y present the principles WSDL-S is based on (in Section 10.6.1), and we shortly describe the extensibility elements used and the annotations that can be created (in Section 10.6.2).
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10.6.1. Aims and Principles
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Starting from the assumption that a semantic model of the Web service already exists, WSDL-S describes a mechanism to link this semantic model with the syntactical functional description captured by WSDL. Using the extensibility elements of WSDL, a set of annotations can be created to semantically describe the inputs, outputs, and the operation of
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See http://lsdis.cs.uga.edu/.
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THE WSDL-S APPROACH
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Figure 10.9 Associating semantics to WSDL elements (Akkiraju et al., 2005).
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a Web service. By this the semantic model is kept outside WSDL, making the approach agnostic to any ontology representation language (see Figure 10.9). The advantage of such an approach is that it is an incremental approach, building on top of an already existing standard and taking advantage the already existing expertise and tool support. In addition, the user can develop in WSDL in a compatible manner both the semantic and operational level aspects of Web services. WSDL-S work is guided by a set of principles, the most important of them being listed below:  Build on Existing Web Services standards: Standards represent a key point in creating integration solutions and as a consequence, WSDL-S promotes an upwardly compatible mechanism for adding semantics to Web services.  Annotations Should be Agnostic to the Semantics Representation Language: Different Web service providers could use different ways of representing the semantic descriptions of their services and furthermore, the same Web service provider can choose more than one representation form in order to enable its discovery by multiple engines. Consequently, WSDL-S does not prescribe what semantic representation language should be used and allows the association of multiple annotations written in different semantic representation languages.  Support Annotation of XML Schema Data Type: As XML Schema is an important data de nition format and it is desirable to reuse the existing interfaces described in XML, WSDL-S supports the annotation of XML Schemas. These annotations are used for adding
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SEMANTIC WEB SERVICES APPROACHES AND PERSPECTIVES
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semantics to the inputs and outputs of the annotated Web service. In addition, an important aspect to be considered is the creation of mappings between the XML Schema complex types and the corresponding ontological concepts. As WSDL-S does not prescribe an ontology language, the mapping techniques would be directly dependent of the semantic representation language chosen. In the next subsection we present in more details the extensibility elements of WSDL and how they can be used in annotating the inputs, outputs, and operations of Web services.
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10.6.2. Semantic Annotations
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WSDL-S proposes ve extensibility elements to be used in annotating the inputs, outputs, and operations of Web services:  modelReference: Extension element that denotes a one-to-one mapping between schema elements and concepts from the ontology;  schemaMapping: Extension attribute that can be added to XSD elements or complex types to associate them with an ontology (used for one-to-many and many-to-one mappings);  precondition: Extension element (child of the operation element) used to point to a combination of complex expressions and conditions in the ontology, that have to hold before the execution of the Web service s operation;  effects: Similar with preconditions, with the difference that the conditions in the ontology have to hold after the execution of the Web service s operation.  category: Extension attribute of the interface element that points to categorization information that can be used for example when publishing the Web service. Each of these elements can be used to create annotations; in the rest of this section we brie y describe each type of annotations, pointing to the extensibility elements used. 10.6.2.1. Annotating the Input and Output Elements If the input or the output is a simple type it can be annotated using the extensibility of the XML Schema element: the modelReference attribute is used to associate annotations to the element. If the input or the output is a complex type two strategies can be adopted: bottom level annotation and top level annotation. In bottom level annotation all the leaf elements can be annotated with concepts from the ontology. The modelReference attribute is used here in a similar manner as above. While this method is simple, it makes
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