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As mentioned in 3.3.1 above, some queries
cover more than one topic. It was originally hoped to allow users to
conduct separate searches for each topic in a single session, and then
combine their results to identify the documents of principle interest.
Quite apart from the interface implications, a fully satisfactory
treatment of facets will require theoretical work to integrate them into
the basic Okapi probabilistic model for term weighting and document
ranking.
PAYNE A
Wed Jul 3 14:11:32 BST 1996