Federated search refers to the brokered retrieval of content from a set of auxiliary retrieval systems instead of from a single, centralized retrieval system. Federated search tasks occur in, for example, digital libraries (where documents from several retrieval systems must be seamlessly merged) or peer-to-peer information retrieval (where documents distributed across a network of local indexes must be retrieved).
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@inproceedings{fedsci-tutorial,
year = {2010},
title = {From federated to aggregated search},
booktitle = {SIGIR '10: Proceedings of the 33rd annual international ACM SIGIR conference on Research and development in information retrieval},
author = {Fernando Diaz and Mounia Lalmas and Milad Shokouhi}
}