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Concept hierarchies greatly help in the organization and reuse of information and are widely used in a variety of information systems applications. In this paper, we describe a method for efficiently storing and querying data organized into concept hierarchies and dispersed over a DHT. In our method, peers individually decide on the level of indexing according to the granularity of the incoming queries. Roll-up and drill-down operations are performed on a per-node basis in order to minimize thedoi:10.1145/1551609.1551627 dblp:conf/hpdc/AsikiTK09 fatcat:kao5t4qc45gwllfmhnrauxlnti