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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 (2015 version):
- 29.2%
refer to chemical compounds and drugs (D category), both exogenous
and endogenous;
- 23.0%
of the total are anatomical terms (A category), organisms (B
category) and phenomena and processes (G category);
- 14.5%
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 21.9%;
- Public
Health (SP category) is represented by 10.9%, Homeopathy (HP
category) by 6.1%, Health Surveillance (VS category) by 2.6%,
and Science and Health (SH category) by 0.7%. These last four
categories were especially developed to better represent the
literature generated in the countries of the region.
Updated: April, 2015
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