Try to use GWT with an rdf engine (Jena or/and Sesame). The goal is simple : - a search page - a read/write information
The project will study the performance of the solution and will try to extract good practice.
After this basic integration, may a technical brick will appear.
If it's a pleasure to marry gwt with an rdf/rdfs database, it will (may be) a good idea to study Rdfa integration, google map with RDF ressources and more application ...
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