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...different rank list for different context or adding document from different context in a single rank list. Resources: http://nlp.stanford.edu/IR-book/html/htmledition/ponte-and-crofts-experiments-1.html http://dl.acm.org/citation.cfm?id=291008 http://goo.gl/klqYy http://dl.acm.org/citation.cfm?id=1860709 I have compiled and installed xapian and tried playing with xapian in past few days.I have few queries regarding xapian :- 1. xapain supports relevance feedback(query expansion) through " Xapian::Enquire::get_eset" function.which algorithm is used to expand query in Enquire class. Sin...