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
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 (2018 version):
29.7% refer to chemical compounds and drugs (D category), both exogenous and endogenous;
23.3% of the total are anatomical terms (A category), organisms (B category) and phenomena and processes (G category);
14.3% 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 22.5%;
Public Health (SP category) is represented by 10.5%, Homeopathy (HP category) by 5.8%, Health Surveillance (VS category) by 2.4%, 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 2018