SlideWiki | undefined | Generic Application Structure (cont')

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Legacy System layer: consists of existing data sources and IT systems provided by each of the involved governmental parties
Service Abstraction layer: exposes the functionalities of the legacy systems as Web services, abstracting from the hardware and software platforms of the legacy systems. Whenever a new service is available at this layer, it will be semantically described and properly linked to existing semantic descriptions.
Semantic Web Service layer: given a goal request this layer, will
- discover a candidate set of Web services,
- select the most appropriate,
- mediate any mismatches at the data, ontological or business process level, and
- invoke the selected Web services whilst adhering to any data, control flow and Web service invocation requirements
Presentation layer: is a Web application accessible through a standard Web browser.

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