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WORKSHOP
the success of the implementation depends on the language. for English,
for example, there are very eficient algorithms for lemmatisation as well as for
the reduction to roots. Other languages are more complicated, in particular
those which function with discontinued word forms such as German and
Dutch.
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In other languages there are not only modiications of the beginning or
end, but there are inlexions as well. In any case, these computer linguistic
technologies are auxiliaries for retrieval approaches, which are based on
Boolean methods or even go much further.
Classiication
this method is supposed to be the oldest one, particularly because it was,
and still is, used in libraries. the text objects are classiied according to the
themes they deal with. most of these systems have a hierarchical structure.
One of the most sophisticated classiication systems is the Universal Decimal
Classiication, which in its core version consists of over 56 000 terms accompanied
by another 13 000 common auxiliaries. the latter cover subjects
such languages, etc. the complete system currently contains about 220 000
terms. the system was created by two Belgian librarians at the end of the 19th
century. An important characteristic of this system is that various categories
may be linked to each other. thus it is possible to treat quite sophisticated research
requests.
this is an extract from the Universal Decimal Classiication.
0 Generalia
00 Prolegomena. fundamentals of knowledge and culture.
Computer science
001 Science and knowledge in general. Organisation of
intellectual work
002 Documentation. Books. writings. Authorship
003 writing systems and scripts. Including: signs and symbols
004 Computer science and technology. Computing
004.2 Computer architecture
004.3 Computer hardware
004.4 Software
004.5 human–computer interaction
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