fication[21] system, developed by Paul Otlet and Henri
Lafontaine on the basis of the Dewey Decimal Classification system is still considered one of
their most important realizations as well as a corner-stone in Otlet's overall vision. Its
adoption, revision and use until today demonstrate a thoughtful and successful approach to
the classification of knowledge.
The UDC differs from Dewey and other bibliographic systems as it has the potential to
exceed the function of ordering alone. The complex notati