In the foregoing paragraphs, mechanisms that
have the aim of arriving at a better representation of
a document’s aboutness have been looked. Enhancing
the effectiveness of classifiers has been the main
focus of research and a range of new techniques
(Support Vector Machines, Neural Networks, etc)
has been developed.. There are also technologies
that help enhance queries; some global methods
are discussed in the literature; a mention of these
is appropriate here primarily because they make
use of classificatory tools. Some of the widely
employed technologies are: