SemWIQ
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Currently access to remotely available RDF data can be achieved through SPARQL endpoints (e.g. Joseki) eventually using wrappers (like D2R on-top of a relational database). However, when accessing a remote SPARQL endpoint, the user has to know exactly which endpoint to address (the endpoint's URL) and what data the endpoints stores, i.e. the user of the service has to be in the know, especially about the vocabularies used on the endpoint. This is often not very practical, especially when using Semantic Web technologies for data integration on the Web.
The Semantic Web Integrator and Query Engine (SemWIQ) is a middleware enabling the virtual access to distributed RDF data sources. To support a range of different heterogeneous (legacy) information systems endpoints may use wrappers to map data from various sources to RDF. SemWIQ will allow to issue global queries to retrieve data from different sits on-the-fly (virtual integration). The mediator which is based on ARQ2 from HP Labs' Jena project will try to find optimized plans to execute global queries.
The implementation of SemWIQ is a sub-project of G-SDAM, which uses SemWIQ to enable semantic data integration for Grids like the Austrian Grid.
The project website is located at http://semwiq.sourceforge.net
