SEMANTIC WEB SERVICES APPROACHES AND PERSPECTIVES in .NET

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SEMANTIC WEB SERVICES APPROACHES AND PERSPECTIVES
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10.5.2. The IRS-III Architecture
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In addition to ful lling the design principles listed above especially, supporting capability-based invocation the IRS-III architecture has been created to link ontology-based descriptions with the components which support SWS activities. The IRS-III architecture is composed by the main following components: the IRS-III Server, the IRS-III Publisher, and the IRS-III Client, which communicate through a SOAP-based protocol, as shown in Figure 10.814. At the heart of the server is the WSMO library where the WSMO de nitions are stored using our representation language OCML (Motta, 1998). The library is structured into knowledge models for WSMO goals, Web services, and mediators. The structure of each knowledge model is similar but typically the applications consist of mediator models importing from relevant goal and Web service models. Following our design principle of inspectibility all information relevant to a Web service is stored explicitly within the library. Within WSMO a Web service is associated with an interface which contains an orchestration and choreography. Orchestration speci es the control and data ow of a Web service which invokes other Web services
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The IRS-III server architecture.
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The IRS-III browser/editor and publishing platforms are currently available at http://kmi.open.ac.uk/projects/irs/
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THE IRS-III APPROACH
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(a composite Web service). Choreography speci es how to communicate with a Web service. The choreography component communicates with an invocation module able to generate the required messages in SOAP format. A mediation handler provides functionality to interpret WSMO mediator descriptions including running data mediation rules, invoking mediation services, and connecting multiple mediators together. Following from the openness principle above orchestration, choreography, and mediation components are themselves Semantic Web services. At the lowest level the IRS-III Server uses an HTTP server written in lisp (Riva and Ramoni, 1996), which has been extended with a SOAP (XML Protocol Working Group, 2003) handler. Publishing with IRS-III entails associating a speci c web service with a WSMO web service description. When a Web service is published in IRSIII all of the information necessary to call the service, the host, port, and path are stored within the choreography associated with the Web service. Additionally, updates are made to the appropriate publishing platform. The IRS contains publishing platforms to support the publishing of standalone Java and Lisp code, and of Web services. Web applications accessible as HTTP GET requests are handled internally by the IRS-III server. IRS was designed for ease of use, in fact a key feature of IRS-III is that Web service invocation is capability driven. The IRS-III Client supports this by providing a goal-centric invocation mechanism. An IRS user simply asks for a goal to be solved and the IRS broker locates an appropriate Web service semantic description and then invokes the underlying deployed Web service.
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10.5.3. Extension to WSMO
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The IRS-III ontology is currently based on the WSMO conceptual model with a number differences mainly derived from the fact that in IRS-III the aim is to support capability driven Web service invocation. To achieve these goals, Web services are required to have input and output roles. In addition to the semantic type the soap binding for input and output roles is also stored. Consequently, a goal in IRS-III has the following extra slots has-input-role, has-output-role, has-input-role-soap-binding, and has-outputrole-soap-binding. Goals are linked to Web services via mediators. More speci cally, the WG Mediators found in the used-mediator slot of a Web service s capability. If a mediator associated with a capability has a goal as a source, then the associated Web service is considered to be linked to the goal. Web services which are linked to goals inherit the goal s input and output roles. This means that input role de nitions within a Web
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SEMANTIC WEB SERVICES APPROACHES AND PERSPECTIVES
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service are used to either add extra input roles or to change an input role type. When a goal is invoked the IRS broker creates a set of possible contender Web services using the WG Mediators. A speci c web service is then selected using an applicability function within the assumption slot of the Web service s associated capability. As mentioned earlier the WG Mediators are used to transform between the goal and Web service input and output types during invocation. In WSMO the mediation service slot of a mediator may point to a goal that declaratively describes the mapping. Goals in a mediation service context play a slightly different role in IRS-III. Rather than describing a mapping goals are considered to have associated Web services and are therefore simply invoked. IRS clients are assumed to be able to formulate their request as a goal instance. This means that it is only required choreographies between the IRS and the deployed Web services. In IRS-III choreography execution thus occurs from a client perspective (Domingue et al., 2005), that is to say, to carry out a Web service invocation, the IRS executes a web service client choreography which sends the appropriate messages to the deployed Web service. In contrast, currently, WSMO choreography describes all of the possible interactions that a Web service can have.
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