We first discuss related work in Sect.
2, before presenting an overview of our approach in Sect.
3. An overview of the proposed architecture is given in Sect.
4 with the content aggregation engine described in Sect.
5. Details of the implementation of the Sift system are given in Sect.
6. In Sect.
7, we highlight the advantages of our approach with the help of a scenario.
Concluding remarks as well as some ideas for future work are given in Sect. 8.