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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.
DeCS vocabulary concepts are distributed as
follows (2011 version):
·
26.4%
refer to chemical compounds and drugs (D category), both exogenous and
endogenous;
·
20.7%
of the total are anatomical terms (A category), organisms (B category) and
phenomena and processes (G category);
·
13.2%
of the total refer to diseases (C category);
·
categories
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 20.6%;
·
Public
Health (SP category) is represented by 10.3% 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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