APPLYING SEMANTIC TECHNOLOGY TO A DIGITAL LIBRARY in .NET

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place names, and company names within the library content, and provide the semantic annotations which can be queried by the semantic query component. The ontology construction components create the ne-grained subtopic structure within a set of documents (textual items) classi ed by an information space. The ontology construction components also enable new information to be classi ed against topics in the BT digital library ontology. Instance disambiguation components identify potential ambiguities in the instance data, for example the author identi cation component identi es equivalent author names within the BT digital library ontology and disambiguates where authors share a common name and initials. This in turn enables further metadata to be generated that links instances concerned with a particular author. The natural language generation component enables natural language statements to be built from the information held in the ontology. Such statements are used to enhance the way in which information is presented to users. For example information about people, companies, related topics and relevant information spaces is presented to the user in preference to listing a set of search results. Additionally, natural language generation can be used to generate descriptions of topics and information spaces. The components that are required to populate, annotate, store, index and manage the BT digital library ontology and enable the ontology to evolve over time are provided in the semantic layer. The process of adapting the ontology is supported by components that discover changes in the underlying data and that can adapt the ontology incrementally in accordance with those changes. End user interaction with the digital library is also analysed to enable changes to be made to the ontology that would best suit the needs of end users. The ontology mediation component uni es any underlying ontologies that are used in the BT digital library, for example ontology-mapping rules enable equivalent classes in different underlying ontologies to be mapped to each other, thereby facilitating querying across equivalent classes. 11.5.3.3 The Integration Layer The integration layer provides the infrastructure that enables the applications to be built from SEKT components (in the semantic layer). The integration functions are provided by SEKT Integration Platform (SIP). The SIP infrastructure also enables semantic layer components to be integrated, for example the integration of data mining components with GATE.9
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11.5.3.4. The Applications Layer The BT digital library applications utilise the components of the semantic layer. In general, applications such as the search and browse, and, search agent applications, query the data held in the BT digital library ontology through the inference engine via the SIP. The architecture also allows for applications to interface directly to semantic layer components where necessary. The alerting component, which is common to all applications that push information to users, enables information alerts to be delivered at a time and in a format that is suitable to the user. A pro le construction component, which is integrated with a web browser, enables pro les of users interests to be constructed. 11.5.3.5. The Presentation Layer Client devices interact with the presentation layer of the architecture. A device independent presentation component presents the user interface for each end-user application according to the capabilities of the device being used and to the preferences set by the user.
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11.5.4. Deployment View of the BT DIGITAL LIBRARY
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The BT digital library architecture has been implemented on two Sun Microsystems servers. All components in the semantic, application and presentation layers have been deployed on a Sun Blade 1500 server running SunOS 5.9. The back end databases for Inspec and ABI/ INFORM are provided on the existing BT digital library Sun Fire V240 server, running SunOS 5.8.
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Today digital libraries are walled gardens; stocked with knowledge of known provenance and hence in which a degree of trust is possible; relatively well catalogued and provided with metadata; and for which a charge exists for entry. Outside these walls lies the Web with a vast quantity of information; some of it immensely valuable but much of dubious provenance and validity; with limited or no cataloguing and limited metadata; but free for all. The history of information and communication technologies is one of disappearing barriers. Witness the attempt to create walled gardens by companies such as AOL in the previous decade. Digital libraries will not escape this trend. The future Semantic Web will include a wide variety of heterogeneous resources. de Roure et al. (2005) describe a Semantic Grid which
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