| Abstract: | The correlation between the semantically close triads of the terms “rubric-rubrication-rubricator” and “class-classification-classifier” is considered in the historical aspect. The main types and structures of indices (codes of classifiers) of STI databases with various themes (VINITI RAS, INSPEC, PASCAL, JICST, Chemical Abstracts, COMPENDEX, Science Citation Index (SCI), GeoRef, METADEX, AEROSPACE and High Technology) are illustrated proceeding from the modern definition of the concept of classification systems. |
