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To facilitate the search for relevant information across a set of online distributed collections, a federated information retrieval system typically represents each collection, centrally, by a set of vocabularies or sampled documents. Accurate retrieval is therefore related to how precise each representation reflects the underlying content stored in that collection. As collections evolve over time, collection representations should also be updated to reflect any change, however, a currentdoi:10.1145/1277741.1277829 dblp:conf/sigir/ShokouhiBA07 fatcat:timbvowpund2rion3nmkabl4f4