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...f implementing a weighting scheme before I start working on implementing DFR schemes. I read the following as references and I think Ive understood it well and can write the hack :- 1.) http://nlp.stanford.edu/IR-book/html/htmledition/document-and-query-weighting-schemes-1.html 2.) http://classes.seattleu.edu/computer_science/csse470/Madani/ABCs.html 3.) http://en.wikipedia.org/wiki/Tf%E2%80%93idf The basic philosophy is that rare terms (terms which occur in a few documents) should be able to give a higher weight to the documents they index compared to terms which occur in many documents .Also,the...