PICSEL 3

In PICSEL 3, the mediation architecture of the information integration system is hybrid. The mediator also integrates a local data warehouse which contains data given by content providers. These data are conform to the mediator schema represented in RDFS+ language (RDFS extended by a fragment of OWL-DL). The data warehouse was progressively enriched by external data. One of the main goals of PICSEL 3 was the semantic treatment of the mediator answers. More accurately we studied the refer- ences reconciliation problem in order to eliminate redundancies and to fusion data coming from different sources. Another goal was to propose an approach where wrappers and integration systems are built semi-automatically.