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Generic Application Structure (cont')
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.