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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.
The distribution of DeCS vocabulary concepts
are (2010 version):
·
25.8%
refer to chemical compounds and drugs (D category), both exogenous and
endogenous;
·
20.4%
of the total are anatomical terms (A category), organisms (B category) and
phenomena and processes (G category);
·
12.9%
of the total refer to diseases (C category);
·
areas
such as techniques and equipment (E category), allied sciences (F, H, I, J,
K, L, M and N categories), publication characteristics (V category) and
geographic locations (Z category) altogether represent 21.6%;
·
the
area of Public Health (SP category) is represented by 10.2% of the total,
Homeopathy (HP category) by 5.7%, Environmental Health (VS category) by 2.4%,
and Science and Health (SH category) by 0.6%. These last four categories
were especially developed to better represent the literature generated in
the countries of the region.
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