I like to think of classification as being like a map, bringing related
topics together and arranging topics in a logical order in "subject
space". In a modern faceted classification, the space is
multi-dimensional.
A single concept can occur in more than one place, as the arrangement of
concepts is not subject to the constraints of arranging physical items
which can only be in one place at a time.
It is the logical arrangement that constitutes a classification, not the
presence or absence of a symbolic notation, but such a notation, like a
grid reference on a map, is generally used to show where a topic will be
found.
An index is complementary, like a gazetteer, and allows you to go
directly to a concept from its name (possibly via a reference to an
alternative name). It may also give the "grid reference" (notation)
where that concept is to be found in a classification scheme.
It is desirable to provide both approaches, to provide for both browsing
and specific searching, and it is best if they can be constructed
together to provide an integrated subject retrieval mechanism.
Leonard Will
--
Willpower Information (Partners: Dr Leonard D Will, Sheena E Will)
Information Management Consultants Tel: +44 (0)20 8372 0092
27 Calshot Way, Enfield, Middlesex EN2 7BQ, UK. Fax: +44 (0)870 051 7276
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