Library-bibliographical classification systems are a means of reflection and access to the scientific achievements and practices of humanity in the past, present and future.
Library-bibliographical classification systems are also important for the theory of document management and practical informational and documentary activities. Library-bibliographical classification systems are aimed to systematization, search and studying the whole variety of existing types of documents in terms of content, formalities and other characteristics.
As a rule, library-bibliographical classification systems are represented in a set of basic and auxiliary tables, an alphabetical index and an application methodology.