Hope this isn't out of context - but Dan makes a very valid point. Besides the potential performance slowdown if NLP was always applied to a users query - there are times that an exact term match is desired without the "query expansion" that an NLP process normally requires.
Query expansion can (and I believe should) be done efficiently outside the core of search engine. After all, it's a process of changing the query according to some expansion/rewriting algorithms, but it is still the unchanged search engine that in the end has to answer the new query...
-- Best regards, Andrzej Bialecki
------------------------------------------------- Software Architect, System Integration Specialist CEN/ISSS EC Workshop, ECIMF project chair EU FP6 E-Commerce Expert/Evaluator ------------------------------------------------- FreeBSD developer (http://www.freebsd.org)
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