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Research: Deliverables: D3.2 Prototype RDF rating servicesThis deliverable demonstrates several prototype applications of the W3C Resource Description Framework (RDF) in the context of the DESIRE work on web indexing and quality-assured information gateways. This work builds upon, and implements in part, the analyis undertaken earlier as D3.1 - Quality Ratings in RDF. The documentation and demonstrators for D3.2 consist of two parts, undertaken by ILRT and UKOLN respectively. UKOLN's work focuses on the integration of quality-oriented attributes into the ROADS search and retrieval environment, and presents a prototypical client-side interface to one such rating bureau. The ILRT demonstrators contrast the facilities offered by a generic RDF datastore with a more traditional relational database approach, showing how either approach can be integrated into more general RDF-based information services. Demonstators and documentationThe demonstrators are maintained on separate sites and can be accessed from the URLs below.
Motivating ScenariosThe following 'motivating scenarios' are taken from the earlier D3.1 report. While the current demonstrators do not address all these applications (for example digital signatures) we present frameworks and software toolkit components that are intended to be usable for such purposes.
Scenarios such as these present a considerable challenge - they raise questions about trust, about machine vocabularies for describing both Web resources and for characterising the agencies which create those descriptions. In addition these scenarios suggest problems which are more architectural in nature: how, for example, can one service discover which other metadata servers offer useful descriptions for some given URL. The 'RDF quality vocabulary' strand of activity in DESIRE attempts to make some contribution towards addressing these issues, and does so in the broader context of the DESIRE Subject Gateway activity and the work on distributed indexing and searching. The scope of the discussion and recommendations which follow are consequently more constrained than the list of 'motivating scenarios' given above might suggest. When combined with the technologies, services and recommendations developed elsewhere within DESIRE, the framework outlined here should go some way towards addressing many of the issues raised in the motivating examples above. |
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