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10.2. THE WSMO APPROACH
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The WSMO initiative1, part of the SDK Cluster2, is the major initiative in the area of SWS in Europe and has the aim of standardizing a unifying framework for SWS which provides support for conceptual modeling and formally representing services, as well as for automatic execution of services. In this Section we provide a general overview of the elements
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http://www.wsmo.org http://www.sdk-cluster.org/
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THE WSMO APPROACH
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WSMO
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A Conceptual Model for SWS
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WSML
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that are part of the WSMO approach to SWS (see Figure 10.1): the Web service Modeling Ontology (WSMO) a conceptual model for Semantic Web Services (Section 10.2.1), the Web Service Modeling Language (WSML) a language which provides a formal syntax and semantics for WSMO (Section 10.2.2), and the Web Service Modeling Execution Environment (WSMX) an execution environment, which is a reference implementation for WSMO, offering support for interacting with Semantic Web Services (Section 10.2.3).
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10.2.1. The Conceptual Model The Web Services Modeling Ontology (WSMO)
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WSMO (Roman et al., 2005) provides ontological speci cations for the core elements of Semantic Web services. In fact, Semantic Web services aim at an integrated technology for the next generation of the Web by combining Semantic Web technologies and Web services, thereby turning the Internet from a information repository for human consumption into a world-wide system for distributed Web computing. Therefore, appropriate frameworks for Semantic Web services need to integrate the basic Web design principles, those de ned for the Semantic Web, as well as design principles for distributed, service-orientated computing of the Web. WSMO is, therefore, based on the following design principles:  Web Compliance: WSMO inherits the concept of Universal Resource Identi er (URI) for unique identi cation of resources as the essential design principle of the Word-Wide Web. Moreover, WSMO adopts the concept of Namespaces for denoting consistent information spaces, supports XML and other W3C Web technology recommendations, as well as the decentralization of resources.
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A Formal Language for WSMO
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An Execution Environment for WSMO
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Figure 10.1 The WSMO approach to SWS.
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SEMANTIC WEB SERVICES APPROACHES AND PERSPECTIVES
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 Ontology Based: Ontologies are used as the data model throughout WSMO, meaning that all resource descriptions as well as all data interchanged during service usage are based on ontologies. Ontologies are a widely accepted state-of-the-art knowledge representation, and have thus been identi ed as the central enabling technology for the Semantic Web. The extensive usage of ontologies allows semantically enhanced information processing as well as support for interoperability; WSMO also supports the ontology languages de ned for the Semantic Web.  Strict Decoupling: Decoupling denotes that WSMO resources are de ned in isolation, meaning that each resource is speci ed independently without regard to possible usage or interactions with other resources. This complies with the open and distributed nature of the Web.  Centrality of Mediation: As a complementary design principle to strict decoupling, mediation addresses the handling of heterogeneities that naturally arise in open environments. Heterogeneity can occur in terms of data, underlying ontology, protocol, or process. WSMO recognizes the importance of mediation for the successful deployment of Web services by making mediation a rst class component of the framework.  Ontological Role Separation: Users, or more generally clients, exist in speci c contexts which will not be the same as for available Web services. For example, a user may wish to book a holiday according to preferences for weather, culture, and childcare, whereas Web services will typically cover airline travel and hotel availability. The underlying epistemology of WSMO differentiates between the desires of users or clients and available services.  Description versus Implementation: WSMO differentiates between the descriptions of Semantic Web services elements (description) and executable technologies (implementation). While the former requires a concise and sound description framework based on appropriate formalisms in order to provide a concise for semantic descriptions, the latter is concerned with the support of existing and emerging execution technologies for the Semantic Web and Web services. WSMO aims at providing an appropriate ontological description model, and to be complaint with existing and emerging technologies.  Execution Semantics: In order to verify the WSMO speci cation, the formal execution semantics of reference implementations like WSMX as well as other WSMO-enabled systems provide the technical realization of WSMO. This principle serves as a mean to precisely de ne the functionality and behavior of the systems that are WSMO compliant.  Service versus Web service: A Web service is a computational entity which is able to achieve a user goal by invocation. A service, in contrast, is the actual value provided by this invocation (Baida, 2005;
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