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Overview of DeCS's tree structure
DeCS follows the
tradition of the classification systems and their respective subject heading
lists which have been transformed into specialized vocabularies without,
however, changing the structures of the classification systems from which
they originated. Its tree
structure is
well-grounded in the division of knowledge in decimal classes and
subclasses respecting their conceptual and semantic relationships, and its
terms are presented in a hybrid structure of pre- and post-coordination. See also the qualifier hierarchical tree.
When evaluating the
proportionality of terms in its contents, we find some interesting numbers.
From the aproximately 160.000 DeCS terms (2004 version):
- 24,5% refer to chemical
compounds and drugs, both exogenous and endogenous;
- 21,9% of the total are the
anatomical terms, the organisms and the biological sciences;
- the terms referring to
disease, a very comprehensive category, represent 13,5% of the total;
- other areas such as techniques,
equipment, allied sciences and geographic areas together represent
21,2%;
- we emphasize still the areas
of Public Health and Homeopathy which represent each 12,3% and 6,6% of the
total of terms, respectfully. These last two categories were
especially developed to better represent the literature generated in
the countries of the region.
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